Special sacs developed from the intersegmental septa lodge the developing ova and sperm.
To this category belong certain sacs and pouches.
They are essentially spherical, pear-shaped or oval sacs opening on to the exterior but closed at the coelomic end.
The two long ovarian sacs communicate with each other by a transverse bridge before uniting to form the terminal canal.
It is indeed only among the Eudrilidae that the enclosure of the ovaries in septal sacs is at all general.
Egg sacs as large or nearly so as sperm sacs.
The walls of the renal sacs are deeply plaited and thrown into ridges.
Sperm ducts and atria as in Limicolae; egg sacs large; body wall thick; vascular system and nephridia as in Terricolae.
Egg sacs minute and functionless (?).
Sperm sacs generally occupying a good many segments and with simple interior undivided by a network of trabeculae.
These sacs are dealt with later under the description of the spermathecae, which function they appear to perform.
In Utricularia bladder-like sacs are formed by a modification of leaflets on the submerged leaves.
Sperm sacs generally limited to one or two segments with interior subdivided by trabeculae.
In specialized forms these pulmonary sacs are wholly or partly replaced by tracheal tubes.
The ovaries are epithelial sacs which open into the uteri.
The eversible sacs on the abdominal segments are shown, some protruded and some retracted.
- Proboscis with stylet, " reserve " sacs and muscular bulb of a Hoplonemertine.
1, 1, Position of the two pulmonary sacs of the right side.
actual relation of the glandu- k, Pore leading from the nonlar and non-glandular sacs of glandular sac to the exterior.
The vesiculae seminales are muscular sacs with a mucous lining which is thrown into a series of delicate net-like folds.
In some cases special secreting tissues, resin ducts, oil glands, laticiferous tissue, crystal sacs, &c., may be developed among the ordinary secondary vascular elements.
A fort called Fort Des Moines was established on the site of the city in 1843 to protect the rights of the Sacs and Foxes.
12 and 13 are shown the spermathecae of the genera Hyperiodrilus and Heliodrilus, which are simple sacs ending blindly as in other earthworms, but of which there is only one median opening in the thirteenth segment or in the eleventh.
The large sacs which have been termed vagina are suggestive of the large coelomic spermathecae in Eudrilids, a comparison which needs, however, embryological data, not at present forthcoming, for its justification.
Some amongst them (Tergipes, Eolis) are also remarkable for possessing peculiarly modified cells placed in sacs (cnidosacs) at the apices of these same papillae, which resemble the " thread-cells " of the Coelentera.
It seems probable that it is identical with one of the open sacs in which each shell-plate of a Chiton is formed, and the series of plate-like imbrications which are placed behind the single shell-sac on the dorsum of the curious slug, Plectrophorus, suggest the possibility of the formation of a series of shellsacs on the back of that animal similar to those which we find in Chiton.
The significance of two or more (in Drepanophorus very numerous) small sacs containing so-called " reserve " stylets resembling in shape that of the central dart is insufficiently known.
It has been pointed out that the cavity of the sacs corresponds in many particulars with the coelom of higher animals, and in Lebidinsky's observations on the development there is some support to the view that a coelom exists.
Both male and female gonads consist of more or less lobulated hollow sacs connected with the epidermis by short ducts.
Latex, though chiefly secreted in vessels or small sacs which reside in the cortical tissue between the outer bark and the wood is also found in the leaves and sometimes in the roots or bulbs.
It consists of a definite contractile sac or sacs lying on the dorsal side of the alimentary canal near the oesophagus, and in preparations of Terebratulina made by quickly removing the viscera and examining them in sea-water under a microscope, he was able to count the pulsations, which followed one another at intervals of 30-40 seconds.
The formation of the conducting tubes or secretory sacs which occur in all parts of the higher plants is due either to the elongation of single cells or to the fusion of cells together in rows by the absorption of the cell-walls separating them.
The ventral portion of the neck is formed by the strong crista inferior, on the median side of which is the deep fosses subtrochanterica by which air sacs enter the humerus.
There are, however, in the Eudrilidae, as already mentioned, sacs envolving the ovaries which bore their own way to the exterior, and thus may be termed coelomoducts.
A series 750.) I, The longitudinal of sacs lined with an epithelium, the proexcretory canal; 2, one liferation of which gives rise to the ova of the tags containing the or spermatozoa, alternate between the flame-cells.
The posterior pulmonary sacs (except in Hypochilus) replaced by tracheal tubes; the anterior and posterior pairs replaced by tracheal tubes in the Caponiidae.
The spores, as in the heterosporous Pteridophyta, are of two kindsmicrospores (pollen grains) borne in microsporangia (pollen sacs) on special leaves (sporophylls) known as stamens, and macrospores (embryo-sac) borne in macrosporangia (ovules) on sporophylls known as carpels.
1, The sternum of the first opisthosomatic or genital somite covering the V "' genital aperture and the first pair of lung sacs.
- Opisthosoma without trace of separate terga and sterna, the segmentation merely represented posteriorly by slight integumental folds and the sterna of the 1st and 2nd somites by the opercular plates of the pulmonary sacs.
In some cases the ova, after leaving the mouth, are lodged in the oral arms, and undergo the earliest phases of their development in this situation, accumulating in the grooves that continue the angles of the mouth, and bulging the wall of the groove into sacs or pockets.
The renal organs are a pair of short wide sacs with folded walls lying on either side of the anterior end of the liver.
It was supposed at one time that the air sacs of birds contributed in some mysterious way to flight, but this is now known to be erroneous.
The bats and some of the best-flying birds have no air sacs.
Secretory sacs occur abundantly in the leaflamina, where they appear as short lines between the veins; they are abundant also in the cortex and pith of the shoot, in the fleshy integument of the ovule, and elsewhere.
These spurs, tubes and sacs serve as receptacles for the secretion or containing of nectar.
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.
Spherical sacs, bearing forked spines, described by Williamson under the name of Zygosporites, are frequent, usually in an isolated state.
The sporangia were large pyriform sacs, shortly stalked, and borne in tufts on the branches of the fertile rachis, which developed no lamina.
air sacs of the lungs.
At the end of the airways are clusters of tiny air sacs.
Inside the lungs the bronchi divide into smaller and smaller airways until they end up as small air sacs called alveoli.
Air enters the rear air sacs, passes to the lung and then leaves via the front air sacs.
candidate sacs as designated SACs.
The Golgi apparatus is usually found close to the cell nucleus and consists of one or more stacks of membrane-bound cisternae (sacs ).
In the plankton sessions we found copepods with their egg sacs, barnacle larve andsome diatoms under the highest magnification.
These could also develop into large pus filled sacs found primarily under the armpits and in the groin.
At the same time, carbon dioxide diffuses from the venous blood into the alveolar sacs.
MULDER: Bee stingers and venom sacs recovered subcutaneously from the victim's face, arm and neck.
snuggle sacs are also sold securely online.
The first tranche of 136 candidate SACs was sent to the EC in June 1995.
venom sacs recovered subcutaneously from the victim's face, arm and neck.
The synaptic terminal contains a number of small sacs, called synaptic vesicles.
These structures appear to be absolutely distinctive of the Oligochaeta, unless the sacs which contain sperm and open in common with the nephridia of Saccocirrus (see Haplodrili) are similar.
Segmentation is complete, a gastrula is formed, the blastopore closes, the archenteron gives off two coelomic sacs which, as far as is known, are unaffected by the super ficial segmentation of the body that divides the larva into three segments.
The walls of these sacs give rise at an early stage to muscles which enable the parts of the larva to move actively on one another (fig.
in Palaeophonus) sinking below the surface during growth in connexion with the formation of the four pairs of pulmonary sacs (see fig.
The peritoneum is no longer regarded with awe as inviolable; by modern methods, if not as manageable as other lymphatic sacs, it is at any rate accessible enough without considerable risk to life.
The mesoblastic somites are paired sacs formed from the anterior lateral portions of the primitive streak (fig.
MULDER: Bee stingers and venom sacs recovered subcutaneously from the victim 's face, arm and neck.
Cotton prints, fleece fabrics, blankets and snuggle sacs are also sold securely online.
The edible seeds (actually, these are "arils" - little juice sacs that surround the seeds) will sink to the bottom and the inedible white shell will float on the top.
My Pillow Place offers the mother of extra large floor cushions in its Jaxx Pillow Sacs.
DETC stands for Distance Education and Training Council, an accreditation commission recognized by the U.S. Department of Education, and SACS is the Southern Association of Colleges and Schools.
SACS accredits the remaining states in the southern region of the United States including: Virginia, Florida, Georgia, Kentucky, Mississippi, Louisiana, North and South Carolina, Alabama, Tennessee and Texas.
Usually in August or September, the female produces up to three large, buff-colored egg sacs that are nearly as large as she, each containing between 300 and 1400 eggs.
She anchors the sacs to one side of her resting place near the center of her web to protect them from ants and other possible predators.
Alveoli-The tiny air sacs clustered at the ends of the bronchioles in the lungs in which oxygen-carbon dioxide exchange takes place.
The early symptoms of trachoma include the development of follicles (small sacs) on the conjunctivae of the upper eyelids; pain; swollen eyelids; discharge; tearing; and sensitivity to light.
Emphysema-A chronic respiratory disease that involves the destruction of air sac walls to form abnormally large air sacs that have reduced gas exchange ability and that tend to retain air within the lungs.
RSV infection in young children is also called bronchiolitis, because it is marked by inflammation of the bronchioles, the narrow airways that lead from the large airways (bronchi) to the tiny air sacs (alveoli) in the lungs.
If the two fetuses have separate amniotic sacs, they can either share a placenta or have two separate placentas.
Congenital cystic adenomatoid malformation (CCAM) occurs when one or more lobes of the lungs develop into fluid-filled sacs called cysts rather than into normal lung tissue.
Congenital cystic adenomatoid malformation (CCAM)-A condition in which one or more lobes of the fetal lungs develop into fluid-filled sacs called cysts.
These bronchi branch into smaller air tubes that run within the lungs, leading to the small air sacs of the lungs (alveoli).
Inflammation of a tendon (tendinitis) and inflammation of one of the fluid-filled sacs that allow tendons to move easily over bones (bursitis) usually result from minor stresses that repeatedly aggravate the same part of the body.
Pulmonary edema can result from fluids leaking into the alveoli (air sacs) of the lung.
Babies born too soon have immature lungs that have not developed surfactant, a protective film that helps air sacs in the lungs to stay open.
Surfactant is normally produced in the fetal lungs in the last months of pregnancy, which helps the air sacs to open up at the time of birth so that the newborn infant can breathe freely.
Symptoms related to the fluid-filled sacs in the spine may be less responsive to surgery.
Female lice lay their eggs in sacs called nits that are about 0.04 in (1 mm) long and are glued to shafts of hair close to the scalp.
If a newborn infant is to breathe properly, the small air sacs (alveoli) at the ends of the breathing tubes must remain open so that oxygen in the air can get into the tiny blood vessels that surround the alveoli.
Sometimes a layer of fibrous tissue called a hyaline membrane forms in the air sacs, making it even harder for oxygen to get through to the blood vessels.
In a severe attack that lasts for some time, some of the air sacs in the lung may rupture so that air collects within the chest.
Ministries' distance learning program, and it is accredited through the Southern Association of Colleges and Schools Council of Accreditation and School Improvement (SACS CASI).
Other types of bags include ring flap clutches, sacs, mini-bags, tapered shoulder bags, pouchettes, backpack styles and draw-string purses.
The jellyfish is surrounded by tentacles that are covered in venomous sacs.
In Polytoreutus, also, spermatophores have been found in these spermathecal sacs.
Testes, and occasionally ovaries, enclosed in sacs.
h, Renal epithelium lining the renal sacs.
They are metamerically placed, and belong to the same metamere as the digestive caeca, thus alternating with the generative sacs.
Respiratory organs present in the form of pulmonary sacs.
Two pairs of pulmonary sacs.
(Original as above.) pulmonary sacs, the sternal plates from the 6th to the 11th somites represented by integumental ridges, weakly chitinized in the middle.
aaK6s, a bag), a botanical term for the membranous sacs containing the reproductive spores in certain lichens and fungi.
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 silk glands or vessels consist of two long thick-walled sacs running along the sides of the body, which open by a common orifice - the spinneret or seripositor - on the under lip of the larva.
The reproductive spores are borne in sacs (asci) which form a dense layer on the surface, appearing like a bloom in July; they are scattered by the wind and propagate the disease.
1, ii.-ix.), accompanied by paired eversible sacs, probably respiratory in function - on eight (or fewer) other abdominal segments.
The first of these usually carries a ventral tube, furnished with paired eversible sacs which assist the insects in walking on smooth surfaces, and perhaps serve also as organs for breathing.
The injections are made by means of a hypodermic syringe into the subcutaneous tissue, into a vein, into one of the serous sacs, or more rarely into some special part of the body.
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.
These sacs contain the developing sperm cells or eggs, and are with very few exceptions universal in the group. The testes are more commonly thus involved than are the ovaries.
In Heliodrilus the blind extremity of the spermatheca is enclosed in a coelomic sac which is in connexion with the sacs envolving the ovaries and oviducts.
A slender ciliated gullet (e) leads into a large stomach (st) whose wall consists of large richly ciliated cells with usually a pair of simple secretory sacs opening into it: it may open through an intestine or rectum into the cloaca.
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.