The mesothoracic epimera bound the coxal cavities of the intermediate legs.
The feelers are very small and are often hidden in cavities beneath the head.
- This tribe is distinguished from the Malacoderma and allied groups by the mesothoracic epimera not bounding the coxal cavities of the intermediate legs.
These cavities communicate with the exterior through the gonad ducts, which have nothing to do with them, but whose coelomic funnels are taken up by them in the course of their growth.
It is therefore a haemocoel, the coelom of the developed insect being represented only by the cavities of the genital glands and their ducts.
Such crystals occur either in cavities in mineral-veins and in granitic rocks, or as a lining in agate geodes.
Free sulphur may also result from the decomposition of pyrites, as in pyritic shales and lignites, or from the alteration of galena: thus crystals of sulphur occur, with anglesite, in cavities in galena at Monteponi near Iglesias in Sardinia; whilst the pyrites of Rio Tinto in Spain sometimes yield sulphur on weathering.
Crystals are found as a rarity in the amygdaloidal cavities of igneous rocks.
Fleas are wingless insects, with a laterally compressed body, small and indistinctly separated head, and short thick antennae situated in cavities somewhat behind and above the simple eyes, which are always minute and sometimes absent.
There are five pairs of larger sacs belonging to the pulmonary system: - (1) prebronchial or cervical, extending sometimes far up the neck, even into the cranial cavities; the throat-bags of the prairie fowls (Cupidonia and Pedioecetes) are a further development; (2) subbronchial or interclavicular; (3 and 4) anterior and posterior thoracic or intermediate; (5) abdominal sacs.
Much fine amethyst comes from Russia, especially from near Mursinka in the Ekaterinburg district, where it occurs in drusy cavities in granitic rocks.
The book was the Gospel, and the white thing with the lamp inside was a human skull with its cavities and teeth.
In Hirudo and the Gnathobdellidae there is only one system of cavities which consist of four principal longitudinal trunks, of which the two lateral are contractile, which communicate with a network ramifying everywhere, even among the cells of the epidermis.
The gonads and their ducts in the Hirudinea invariably form a closed system of cavities entirely shut off from the coelom in which they lie.
The cells which line them and also the cavities of the tubes contain urates, which are excreted from the blood in the surrounding bodycavity.
The successive cavities are not, however, completely closed from each other; there is some communication between adjoining segments, and the septa are sometimes deficient here and there.
The best crystallized specimens of any mica are afforded by the small brilliant crystals of biotite, which encrust cavities in the limestone blocks ejected from Monte Somma, Vesuvius.
Glessite, a nearly opaque brown resin, with numerous microscopic cavities and dusty enclosures, named from glesum, an old name for amber.
In a few cases some of the tracheids have very thick walls and reduced cavities, functioning as mechanical rather than as waterconducting elements.
of the cell-wall (which is secreted by the living cell-body) the protoplasm dies, and a tissue in which this has occurred consists solely of the dead framework of cell-walls, enclosing in the cavities, originally occupied by the protoplasm, simply water or air.
These cavities are completely roofed by a layer of cells; in the centre of the roof is a pore surrounded by a ring of special cells.
There should also be only a single coelom, or a pair of lateral coelomic cavities.
The epithem is penetrated by a network of fine intercellular spaces, which are normally filled with water and debouch on one or more intercellular cavities below the epidermis.
The same happenchance brought us the learning that children in schools with fluorescent lights get fewer cavities than those in schools with incandescent lighting.
The coagulum is next flattened out by a wooden or iron roller to get rid of the cavities containing watery liquid, and the sheets are then hung up for fourteen days to dry, when they weigh about 2 lb, the sheets being usually z to a in.
These sinuses are completely shut off from all other cavities, they do not open into the main coelomic space nor into the small arm-sinus, nor does the right sinus communicate with the left.
Of these latter, two grades were further distinguished by Lankester - those which remain possessed of a single archenteric cavity and of two primary cell-layers (the Coelentera or Diploblastica), and those which by nipping off the archenteron give rise to two cavities, the coelom or body-cavity and the metenteron or gut (Coelomata or Triploblastica).
As the ova are in many species deposited in a gelatinous tube secreted by the bodywalls, in which they are arranged (three or more together) in flaskshaped cavities, impregnation must probably take place either before or at the very moment of their being deposited.
In the mature stage Pentastomida live in the respiratory passages of mammalia, principally in the nasal cavities.
The adult stage, for example, has been found in the nasal passages of sheep, goats, horses and even of man, and the larval stage in the pleural and peritoneal cavities of dogs and cats.
In the adult of both sexes there are only two teeth, both in the upper jaw, which lie horizontally side by side, and in the female remain throughout life concealed in cavities of the bone.
Pectolite is a secondary mineral occurring as white masses with a radially fibrous structure in the veins and cavities of basic igneous rocks.
Sometimes the central canal is wide and uninterrupted between the two neuropores; in other cases it becomes broken up into a large number of small closed medullary cavities, and in others again it is obsolete.
Dropsy During conditions of health a certain quantity of lymphy liquid is constantly being effused into the tissues and serous cavities of the body, but in the case of the tissues it never accumulates to excess, and in that of the serous cavities it is never more than sufficient to keep them moist.
Where the dropsical condition is more or less general the term " anasarca " is applied to it; if the tissues are infiltrated locally the term " oedema " is employed; and various names are applied, with a local significance, to dropsies of individual parts or cavities, such as " hydrothorax," " hydroperitoneum " or " ascites," " hydrocephalus," and so on.
Dropsy of the serous cavities is very commonly merely part of a general anasarca, although occasionally it may be, as in the case of ascites, the sequel to an obstruction in the venous return.
Thus the defects, whether of this secretion or of that, and again of motor activity, the state of the valvular junctions, the volume of the cavities, and their position in the abdomen, may be ascertained, and dealt with as far as may be; so that, although the fluctuations of chemical digestion are still very obscure, the application of remedies after a mere traditional routine is no longer excusable.
They are usually found in the alimentary canal or its appendages but occasionally work their way into the serous cavities, nervous system and blood vessels.
it has a pharynx and short straight digestive sac: and its mesenchymatous cavities are filled with germ-balls in various stages of development.
The cavities of the hollow tentacles open into a circular canal which surrounds the oesophagus at the base of the lophophore.
Accidents are rarely caused by them, because they are extremely shy and swim away on the least alarm; but, when surprised in the submarine cavities forming their natural retreats, they will, like any other poisonous terrestrial snake, dart at the disturbing object; and, when out of the water, they attempt to bite every object near them, even turning round to wound their own bodies.
- A, Front of head of Sawfly (Pachynematus); a, labrum; b, clypeus; c, vertex; d, d, antennal cavities.
Stomach with four complete cavities.
Journ., 1828), he devoted himself chiefly to the examination of fluid-filled cavities in crystals, and of the microscopic structure of various kinds of fossil wood.
Then followed the discovery of " hard rockphosphate," a massive mineral, often having cavities lined with nearly pure phosphorite.
(2) The body contains but a single internal cavity, the coelenteron or gastrovascular space, which may be greatly ramified, but is not shut off into cavities distinct from the central digestive space.
By forming the bottom of the mould of hoop iron placed on edge and closely packed, and the sides of sand, while the top was left open, Lord Rosse overcame this difficulty, and the hoop iron had the further advantage of allowing the gas developed during the cooling to escape, thus preventing the speculum from being full of pores and cavities.
Shaler, state geologist in 1873-1880, " When the rocks whence they flow were formed on the Silurian sea-floors, a good deal of the sea-water was imprisoned in the strata, between the grains of sand or mud and in the cavities of the shells that make up a large part of these rocks.
In the Upper Mississippi lead region of Missouri, Illinois, Iowa and Wisconsin the ore fills large cavities or chambers in limestone.
It remains in this condition for a period of two to six weeks, and during this time the permanent organs are developed from the cells of two symmetrical cavities behind the adductor muscle.
In them the foot has a flat ventral surface used for creeping, as in Gastropods, the byssus gland is but slightly developed, the pleural ganglia are distinct, there is a relic of the pharyngeal cavity, in some forms with a pair of glandular sacs, the gonads retain their primitive connexion with the renal cavities, and the otocysts are open.
The asterism seems due to the presence of microscopic tubular cavities, or to enclosure of crystalline minerals, arranged in a definite system.
In the Chitons or Polyplacophora, on the other hand, the two cavities are separate, and there are independent genital ducts.
The system of blood-vessels is entirely separate from the coelomic cavities.
The coelom is formed as a cavity or cavities in the interior of these cell-masses.
The mouth is divided into two cavities communicating by a narrow orifice, the anterior one containing the incisors and the posterior the molars, the hairy skin of the face being continued inwards behind the incisors.
The stomach is formed upon much the same principle as that of the horse or rhinoceros, but is more elongated transversely and divided by a constriction into two cavities - a large left cul de sac, lined by a very dense white epithelium, and a right pyloric cavity, with a thick, soft, vascular lining.
Deposits of limonite in cavities may have a rounded surface or even a stalactitic form, and may present a brilliant lustre, of blackish colour, forming what is called in Germany Glaskopf (glass head).
Sometimes the two cavities are restricted to the two ends of the spore, the polaribilocular type and the two loculi may be united From Beitrcge zur Wissenschaftlichen Botanik.
Lecanora Prevostii, Lecidea calcivora) have the power of forming minute cavities in the rock, in which they are partially buried.
In the cavities between the stones, filled with earth, alpine or trailing plants are inserted,.
The coelom differs from that of the Chitons in the fact that the cavities of the genital organs are continuous with it, and in the fact that there is only one pair of coelomoducts resembling the renal organs of Chitons, but serving also as genital ducts.
Much more complicated are the processes in a large series of "fructifications," where the mycelium first develops a densely packed mass of hyphae, all alike, in which labyrinths of cavities subsequently form by separation of hyphae in the previously homogeneous mass, and the hymenium covers the walls of these cavities and passages as with a lining layer.
Aeolotachic contraction further leads to the " pipes " or contraction cavities already described in § 121, and the procedure must be carefully planned first so as to reduce these to a minimum, and second so as to induce them to form either in those parts of the casting which are going to be cut off and re-melted, or where they will do little harm.
But in addition to the greater cost of steel founding as compared with rolling there are two facts which limit the use of steel castings: (1) they are not so good as rolled products, because the kneading which the metal undergoes in rolling improves its quality, and closes up its cavities; and (2) it would be extremely difficult and in most cases impracticable to cast the metal directly into any of the forms in which the great bulk of the steel of commerce is needed, such as rails, plates, beams, angles, rods, bars, and wire, because the metal would become so cool as to solidify before running far in such thin sections, and because even the short pieces which could thus be made would pucker or warp on account of their aeolotachic contraction.
An interesting stone containing nine cavities for measures of capacity found in Pompeii and now preserved in the Naples Museum with Oscan inscriptions erased in antiquity shows that the Oscan system of measurement was modified so as to correspond more closely with the Roman, about 14 B.C., by the duoviri, who record their work in a Latin inscription (C.I.L.
Blende occurs in metalliferous veins, often in association with galena, also with chalcopyrite, barytes, fluorspar, &c. In oredeposits containing both lead and zinc, such as those filling cavities in the limestones of the north of England and of Missouri, the galena is usually found in the upper part of the deposit, the blende not being reached until the deeper parts are worked.
The blue colour, which disappears on heating or dissolving the salt, has been variously ascribed to the presence of sodium subchloride, sodium, sulphur or of a certain compound of iron, or again to the existence of minute cavities with parallel walls.
Minute vesicular cavities are not infrequently present, sometimes as negative cubes, and these may contain saline solutions or carbon dioxide or gaseous hydrocarbons.
The sexual organs - oogonia and antheridia - are borne on special portions of the thallus in cavities known as conceptacles.
It is doubtful whether the convergent action of the streams has been the sole agency in the erosion of these striking cavities, or whether snow and glacier-ice have had a share in the work.
The right side of the heart is frequently dilated, with clots in the cavities.
The generative organs of the oyster consist of a system of branching cavities on each side of the body lying immediately beneath the surface.
All the cavities of a side are ultimately in communication with an efferent duct opening on the surface of the body a little above the line of attachment of the gills.
The genital products are derived from the cells which line the cavities of the genital organs.
For inflammation of the mouth a similar combination is used as a mouth wash, in the throat as a gargle, and in the nose as a wash and sometimes as an ointment or spray, the ointment possessing the advantage of protecting the delicate nasal mucous membrane from irritation by stopping the entrance of irritant dust into the nasal cavities.
Cavities containing liquid occasionally occur in crystals of fluor-spar, notably in the greasy green cubes.
This single cavity and its lining serve apparently for all those functions (digestion, excretion, circulation and often reproduction) which in more complex organisms are distributed among various cavities of independent and often very diverse origin.
In 1821 he was busy with electrical experiments and in 1822 with investigations of the fluids contained in the cavities of crystals in rocks.
These cavities are known as the infundibular or subgenital cavities.
Usually the four subgenital cavities are distinct from each other (so-called tetrademnic condition), but in many Rhizostomeae, for example, Crambessa, the subgenital cavities join together under the subumbral floor of the stomach (so-called monodemnic condition) and coalesce to form a so-called subgenital portico placed on the oral side of the stomach, opening by four interradial apertures between the oral arms, that is to say, by the four primitive apertures of the subgenital pits.
The transparent prolonged into the four long tissues allow the enteric cavities and oral arms, perradial in position.
17 a of endodermal origin, but which, according to recent observations, are formed in the walls of the infundibular cavities, and are therefore of ectodermal origin.
Each taeniola bears a strongly developed longitudinal muscle-band, stated by Claus and Chun to be developed from the endoderm, like the retractor muscles of the anthopolyp, but by other investigators it is affirmed that each retractor muscle of the scyphistoma arises from the lining of a funnel-shaped ectodermal ingrowth (" Septaltrichter ") growing down from the peristome inside each taeniola, in a manner similar to the infundibular cavities of Lucernaria, which in their turn are homologous with the sub f genital cavities of Scypho l A .` medusae.
(After Claus.) by Friedemann (3), a recent investigator of the subject, that the infundibular cavities appear late in the scyphistoma and have no relation either to the septal muscles or to the subgenital cavities of the adult.
In the spicate forms, with sessile spikelets on the main axis, the latter is often dilated and flattened (Paspalum), or is more or less thickened and hollowed out (Stenotaphrum, Rottboellia, Tripsacum), when the spikelets are sunk and buried within the cavities.
Cavities, either rounded or with the same shape ("negative crystals") as the surrounding crystal, are also common; they are often of minute size and present in vast numbers.
Usually these cavities contain a liquid (water, a saline solution, carbon dioxide or petroleum) and a movable bubble of gas.
Thus they not only penetrate all cavities in an exceedingly intrusive manner, but exert pressures in all directions, which, owing to the density of the asphalt, are more than 40 greater than would be produced by a corresponding depth of water.
During the life of the whale the contents of these cavities are in a fluid condition, but no sooner is the "head matter" removed than the solid wax spermaceti separates in white crystalline flakes, leaving the oil a clear yellow fluid having a fishy odour.
These form a more or less complicated canal system, lined by endoderm, and communicating with the cavities of the zooids.
., cavities of adjacent coral `'` lites communicate by means of numerous perforations, which appear to represent solenia, and numerous transverse tab, ?
larger star-shaped cavities, called calices, in which the zooids are lodged, and very numerous smaller round or polygonal apertures, which in life contain as many short unbranched A FIG.
The cavities both of the calices and coenenchymal tubes of Heliopora are closed below by horizontal partitions or tabulae, hence the genus was formerly included in the group Tabulata, and was supposed to belong to the madreporarian corals, both because of its lamellar skeleton, which resembles that of a Ma.drepore, and because each calicle has from twelve to fifteen radial partitions or septa projecting into its cavity.
Each of these cavities presumably excreted waste products to the exterior by a pore.
The middle cavities were smaller, and the ducts from them came to unite with those from the anterior cavities, and no longer opened directly to the exterior; whether these cavities were already specialized as water-sacs cannot be asserted, but they certainly had become so at a slightly later stage.
The posterior cavities were the largest, but what had become of their original opening to the exterior is uncertain.
The genital products were derived from the lining of the coelomic cavities, but it would not be safe to say that any particular region was as yet specialized for generation.
Which of the coelomic cavities this last is connected with is uncertain, for there is considerable doubt as to the origin of the genital glands in the embryonic development of recent echinoderms. It seems clear, however, that there was but a single duct and a single bunch of reproductive cells, as in the holothurians, though perhaps bifurcate, as in some of those animals.
Regarding the Echinoderms as a whole in the light of the foregoing account, we may give the following analytic summary of the characters that distinguish them from other coelomate animals: They live in salt or brackish water; a primitive bilateral symmetry is still manifest in the right and left divisions of the coelom; the middle coelomic cavities are primitively transformed into two hydrocoels communicating with the exterior indirectly through a duct or ducts of the anterior coelom; stereom, composed of crystalline carbonate of lime, is, with few exceptions, deposited by special amoebocytes in the meshes of a mesodermal stroma, chiefly in the integument; reproductive cells are derived from the endothelium, apparently of the anterior coelom; total segmentation of the ovum produces a coeloblastula and gastrula by invagination; mesenchyme is formed in the segmentation cavity by migration of cells, chiefly from the hypoblast.
All living, and most extinct, Echinoderms show the following features, almost certainly due to an ancestral pelmatozoic stage: - An incomplete radial symmetry, of which five is usually the dominant number, is superimposed on the secondary bilateralism, owing to the outgrowth from the mouth region of one unpaired and two paired ciliated grooves; these have a floor of nervous epithelium, and are accompanied by subjacent radial canals from the water-ring, giving off lateral podia and thus forming ambulacra, and by a perihaemal system of canals apparently growing out from coelomic cavities.
All living Echinoderms have a lacunar, haemal system of diverse origin; this, the ambulacral system, and the coelomic cavities, contain a fluid holding albumen in solution and carrying numerous amoebocytes, which are developed in special lymph-glands and are capable of wandering through all tissues.
A, Longitudinal section of the rhizome, including a node and portions of the adjoining internodes; k, septum between the two internodal cavities, hh; gg, vascular bundles; 1, vallecular canal; s, leaf-sheath.
The cavities of the large sporangia were sometimes traversed by trabeculae of sterile tissue resembling those found in Isoetes.
Lastly, the symbiotic relation between the plant and ants is found in Ferns, the rhizome of Polypodium carnosum containing cavities inhabited by these insects.
I, Coelom of the first somite It also shows us that the neurowhich carries the anten meres, no less than the embryonic nae and is in front of the coelomic cavities, point to the existmouth.
The two prosthomeres are indicated by their coelomic cavities in the embryo (I and II, fig.
The three prosthomeres or prae-oral somites of Crustacea due to the sinking back of the mouth one somite farther than in Arachnida are not clearly indicated by coelomic cavities in the embryo, but their existence is clearly established by the development and position of the appendages and by the neuromeres.
The third prosthomere is represented by a well-marked pair of coelomic cavities and the tritocerebrum (III, fig.
This segment is indicated embryologically by its paired coelomic cavities.
The immediate cavities or pits into which the tracheal stigmata open appear to be in many cases ectodermic in sinkings, but there seems to be no reason (based on embryological observation) for regarding the tracheae as an ingrowth of the ectoderm.
Shells may become completely silicified, or may have their cavities occupied by flint with every detail of the interior of the shell preserved in the outer surface of the cast.
thick, with nodular segregations and abundant cavities which are often lined with zeolites.
In front of the brain cavity, the great tubular nasal cavities are provided with well-developed turbinal bones, and are roofed over by large nasals, broad behind, and ending in front in a narrow decurved point.
Sometimes, however, only two cavities remain in the anther, by union of the sacs in each lobe, in which case the anther is said to be bilocular or dithecal.
Occasionally there are numerous cavities in the anther, as in Viscum and Rafesia.
Yet the fact that the long, soft Conchoderma auritum stands exposed on the Coronula, sometimes ten on one, indicates that the whale can have little chance of evicting its tenants, even at the expense of rubbing off the eighteen flattened horns of its own skin embedded in cavities round the domed base of the Coronula shell.
The liquid waxes occur in the blubber of the sperm whale, and in the head cavities of those whales which yield spermaceti; this latter is obtained by cooling the crude oil obtained from the head cavities.
The oils are usually contained in special cells, glands, cavities, or canals within the plants either as such or intermixed with resinous substances; in the latter case the mixtures form oleo-resins, balsams or resins according as the product is viscid, or solid and hard.
A striking feature is the presence of large, radiating intercellular cavities in the cortex, suggesting an aquatic habit.
It occurs in regions of granite, porphyry and syenite, and usually occupies funnelshaped cavities of no great superficial area, but of considerable depth.
Larger rounded lumps of pumice, found in the clay, have probably floated to their present situations, and sank when decomposed, all their cavities becoming filled with sea water.
The acacias and the Rosaceae yield their gums most abundantly when sickly and in an abnormal state, caused by a fulness of sap in the young tissues, whereby the new cells are softened and finally disorganized; the cavities thus formed fill with liquid, which exudes, dries and constitutes the gum.
The uncoloured portions are the dentine or ivory, the shaded parts the cement filling the cavities and surrounding the exterior.
Dentists have used amalgam to fill cavities since the 1800s.
The moles use a similar artifice in clearing out the dirt from the cavities they form by scraping.
Cavities within the massive banded barite are commonly lined with translucent brown prismatic crystals.
cannula into needle hub cavities.
These are rich in beta carotene which helps maintain healthy linings in the nasal cavities.
cavitypreference for growing behind surfaces, or in poorly ventilated cavities means that it is usually not detected until decay is advanced.
cavitysound effects for each mini game, from cake cutting to filling cavities!
cavitye sinus cavities produce the mucus which bathes the lining of the nose.
cavityr larger chest cavities would have supplied much more force to their speech than Homo sapiens could later manage.
chert grits, some small cavities, quartz dust in the clay matrix.
chert fragments, with a few very small to large cavities from former grits.
Sometimes they roost in the lining of tall disused industrial chimneys and other hollow walls including cavities in bridges.
Alternatively, explosions create cavities, for example, as bombs excavate bomb craters.
These titles may have arisen when people slept at floor level, and found earwigs searching for dark cavities.
A distinctive feature of the fabrics is a considerable number of cavities from which an angular grit has leached.
GW3 Thick walled, numerous small to medium chert grits, some small cavities, quartz dust in the clay matrix.
Also, examine the buccal cavities of the human hookworm Nectar Americans.
Additionally, cavities were noted on the first and second deciduous molars of one child and were associated with a dental abscess.
mouldingcontains cavities for a number of packages: Figures 3 and 4 show how molding compound is fed to each of these.
staphylococcus albus and Proteus sp. may also be present in samples taken from the nasal cavities.
Use to close cavities at openings, to prevent thermal bridging.
Another suggestion is that herbs or roots used to relieve toothache were pressed into tooth cavities using a piece of tar.
The metasomatic cavities are divided by dorsal (fig.
2, 3, ov.) lie in the met asomatic cavities, and open to the exterior dorsally by short, highly pigmented oviducts (fig.
Those finer particles of the blood which become extremely rarefied during this process pass off in two directions - one portion, and the least important in the theory, to the organs of generation, the other portion to the cavities of the brain.
It consists of a hollow tube, or tubes, of which the wall is made up of the two body-layers, ectoderm and endoderm, and the cavity is a continuation of the digestive cavities of the nutritive and other appendages, i.e.
This is in accordance with the original use of the term cell, which was applied in the 1 7th century to the cavities of plant-tissues on the analogy of the cells of honeycomb.
The Marchantiaceae (see article BRYOPHYTA) show considerable tissue-differentiation, possessing a distinct assimilative system of cells, consisting of branched cell threads packed with chloroplasts and arising from the basal cells of large cavities in the upper part of the thallus.
The older is that the water travels in the woody cell-walls of the vascular bundles, mainly under the action of the forces of root pressure and transpiration, and that the cavities of the vessels contain only air.
coelomic cavities connected only with the generative system.
The mass of cells undergoes segmentation corresponding with the outer segmentation of the embryo, and a pair of cavities - the coelomic pouches (fig.
Skin-grafting and regeneration of bone are among not the least remarkable applications of pathological principles to the combat with disease in recent times; and in this connexion may also be mentioned the daring acts of surgery for the relief of tumours of the brain, rendered practicable by improved methods of localization, as well as operations upon the serous cavities for diseased conditions within them or in their vicinity.
C q t;: pm .-..,,?i are transferred into two tubes (Solenophoridae); and by the closure of the lower aperture reconstituted into two suckers, the margins of which are produced and folded so as to resemble the leaf-like outgrowths of the next group. In this division (Tetraphyllidea) four suckers or bothria are developed on the scolex, but their cavities are extremely shallow and their lips extremely mobile and variable in shape.
These drums are worked by special muscles, and the cavities in which they lie are protected by conspicuous plates visible beneath the base of the abdomen (see fig.
For the vibration of air in other cavities than long cylindrical pipes we refer to Rayleigh's Sound, vol.
Ligament wanting; shell gaping, with a styloid apophysis in the umbonal cavities.
47, 48), belong to the genera Chromis, Barbus, Capoeta, Discognathus, Nemachilus, Blennius and Clarias; and there is a great affinity between them and the fish of the East African lakes and streams. There are eight species of Chromis, most of which hatch their eggs and raise their young in the buccal cavities of the males.
It consisted of frayed reed pens or brushes, a small pot of water, and a palette with two circular cavities in which black and red ink were placed, made of finely powdered color solidified with gum.
By the weathering of silicates, silica passes into solution and quartz is deposited as a secondary product in the cavities of basic igneous rocks, and in fact in the crevices and along the joints of rocks of almost all kinds.
Known Echinoderms show the following features, imagined to be due to an ancestral pelmatozoic stage :- Increase in the coelomic cavities of the left side, and atrophy of those on the right; the dextral coil of the gut, recognizable in all classes, though often obscured; an incomplete secondary bilateralism about the plane including the main axis and the water-pore or its successor, the madreporite, often obscured by one or other of various tertiary bilateralisms; the change of the hydrocoel into a circumoral, arcuate or ring canal; development through a freeswimming, bilaterally symmetrical, ciliated larva, of which in many cases only a portion is transformed into the adult Echinoderm (where care of the brood has secondarily arisen, this larva is not developed).
dissepi:ments extend to the centre or axis, the ovary is divided into cavities or cells, and it may be bilocular, trilocular (fig.
Fluorescent lighting increases the body's production of saliva, which helps prevent cavities.
Pitting Surface cavities; may be related to fatigue, overload or corrosion.
Staphylococcus albus and Proteus sp. may also be present in samples taken from the nasal cavities.
Large trees with natural breeding cavities, usually woodpecker holes, have been virtually eliminated from the plains.
This tissue lines all of the body cavities and is important barrier against bacteria entering the body.
Another tip for bathrooms is that there are cavities between the studs in the walls.
Sometimes teen braces are a matter of health, as crowded teeth can make it hard to brush correctly, which in turn can cause cavities or gum disease.
They include mouth and throat cancer, cavities and gum disease, heart problems, and other unpleasant side effects.
They may also contain sugar, which leads to cavities.
Then, hollow out small cavities for the eyes, and add small balls of fondant for a nose and ears.
Blow-in insulation is loose insulation blown into cavities and hard-to-reach areas using a special machine.
Do not use the blow-in insulation on cavities, scuttles and drops.
People may snore because they can't breathe well through their nasal cavities.
Remove nasal polyps which can cause inflammation in the nasal cavities and make breathing through the nose difficult.
Cerebrospinal fluid-The clear, normally colorless fluid that fills the brain cavities (ventricles), the subarachnoid space around the brain, and the spinal cord and acts as a shock absorber.
Plaque adheres to the crevices and fissures of the teeth and generates acids that, when not removed on a regular basis, slowly eat away, or decay, the protective enamel surface of the teeth, causing holes (cavities) to form.
The dentist can also perform such diagnostic services as x-ray imaging and such treatments as filling cavities.
More than 40 percent of all children have cavities by the time they reach kindergarten.
This exposure can lead to cavities forming, especially in the upper and lower front teeth.
In fact, adolescence can often be a time when cavities and periodontal disease happen more frequently.
Parents should talk to their children about how important good oral hygiene is in preventing not only cavities, but teeth stains, bad breath, and an assortment of other dental problems.
Bone marrow is the tissue within bone cavities that produces blood cells.
Epithelium-The layer of cells that covers body surfaces, lines body cavities, and forms glands.
Fewer cavities and better tooth health have reduced the number of toothaches.
Toothaches are most often caused by cavities.
Food particles and plaque deposits around orthodontic appliances can cause demineralization of the tooth enamel, leading to cavities and permanent whitish scars on the teeth.
Mucus-The thick fluid produced by the mucous membranes that line many body cavities and structures.
Most infants also develop hydrocephaly, an accumulation of excess fluid in the four cavities of the brain.
However, babies who survive the surgery appear to be 33 to 50 percent less likely to have hydrocephalus, a condition that requires surgically implanted tubes or shunts to remove fluid from the ventricles (cavities of the brain).
Tooth decay, which is also called dental cavities or dental caries, is the destruction of the outer surface (enamel) of a tooth.
The good news is the number of children with cavities in the United States went down in the last few decades of the twentieth century.
Some estimates are that as of the early 2000s cavities among adolescents have been reduced by nearly 40 percent.
When this acid builds up on an unprotected tooth surface, it dissolves the minerals in the enamel, creating holes and weak spots (cavities).
In addition, an individual with two or more areas of tooth decay is at increased risk of developing additional cavities.
Cavities develop most easily in spaces that are hard to clean.
Foods high in sugar and starch, especially when eaten between meals, increase the risk of cavities.
As of 2004, most cavities could be fixed without much discomfort by a medical professional and without any serious longterm consequences if the cavities are found and treated early.
Amalgam-A mixture (alloy) of silver and several other metals used by dentists to make fillings for cavities.
Temporal bones-The compound bones that form the left and right sides of the skull and contain various cavities associated with the ear.
For example, the septum (the cartilage which separates the two nasal cavities from each other) may be slightly displaced (a deviated septum).
Often refers to one of the air-filled cavities surrounding the eyes and nose that are lined with mucus-producing membranes.
Peritoneum-The transparent membrane lining the abdominal and pelvic cavities (parietal peritoneum) and the membrane forming the outer layer of the stomach and interstines (visceral peritoneum).
Beans, dried peas, popcorn kernels, hearing-aid batteries, raisins, and beads are just a few of the many items that have been found in these bodily cavities.
Both dental cavities and misaligned teeth have long been associated with pacifier use.
The ventricles are fluid-filled cavities within the brain, through which cerebrospinal fluid (CSF) normally circulates.
Ventricles-Four cavities within the brain that produce and maintain the cerebrospinal fluid that cushions and protects the brain and spinal cord.
Wild honeybees live in honeycombs or colonies in cavities of buildings or in hollow trees.
The other complication is called intraventricular hemorrhage; this is bleeding into the cavities (ventricles) of the brain, which may be fatal.
Cancellous bone, whose porous structure with small cavities resembles sponge, predominates in the pelvis and the 33 vertebrae from the neck to the tailbone.
Deviated septum-A shift in the position of the nasal septum, the partition that divides the two nasal cavities.
Hydrocephalus is an abnormal expansion of cavities, called ventricles, within the brain, which is caused by an abnormally large accumulation of cerebrospinal fluid (CSF).
These acids dissolve the enamel, causing cavities.
It is believed that fluoridated water is between 20 and 60 percent effective in preventing cavities in children and adults.
However, other factors are recognized in the early 2000s as having contributed to the decline in dental cavities.
They do root planning, take x-rays, and apply sealants and fluoride treatments to protect against cavities.
Locating cavities - A low-powered laser called DIAGNOdent can detect tiny pits in the tooth enamel before they become cavities.
It was discovered at this time that whale oil, obtained from the cavities in the head of the sperm whale, could produce a more stable wax.
Cavities happen when the diamond cutter cuts away a larger diamond crystal.
These can include small pits or cavities, scratches, or chips.
Internal flaws are called "inclusions" and can include cloudy spots, feathers, cavities, and mineral deposits.
Teeth are stronger, promoting less decay and cavities.
The whole of the middle lamella or originally formed cell-wall separating one from another disappears before the adult state is reached, so that the walls of the hydroids consist of a framework of lignified bars, with open communication between the cell cavities.
Such a rock is typically exemplified by a coarse-grained sandstone or conglomerate, while a limestone may be naturally porous, or, like the Trenton limestone of Ohio and Indiana, rendered so by its conversion into dolomite and the consequent production of cavities due to shrinkage - a change occurring only in the purer limestones.
ann, Chitinous annulus, containing air cavities which enable the stato blast to float.
The ovary has many cavities with a large number of ovules attached to its walls, and is surmounted by a flat stigma of many radiating rows as in a poppy.
Coprolites have been found at Lyme Regis, enclosed by the ribs of ichthyosauri, and in the remains of several species of fish; also in the abdominal cavities of a species of fossil fish, Macropoma Mantelli, from the chalk of Lewes.
Frost blisters are pustular swellings due to the up-growth of callus-tissue into cavities caused by the uprising of the superficial cortex under the action of intense cold.
The other is that the vessels are not empty, but that the water travels in their cavities, which contain columns of water in the course of which are large bubbles of air.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.