Epidermis Sentence Examples
This consists typically of close-fitting layers of cells with completely suberized walls, intended to replace the epidermis as the external protective layer of the plant when the latter, incapable as it is of further growth after its original formation, is broken and cast off by the increase in thickness of the stem through the activity of the cambium.
The nerveend-cells, which lie below the lens, are part of the general epidermis.
The epidermis protects the lower layers.
The cells of tl ommatidium are a good deal larger than the neighbouring common cells of the epidermis.
The lenticels of the stem are usually formed beneath stomata, whose function they take up after the stomata have been ruptured and cast off with the rest of the epidermis.Advertisement
Usually they are absent from the cells of the epidermis, though in some of the lower plants they are met with there also.
Among the Archiannelida, in Aeolosoma and some Polychaetes, the whole central nervous system remains imbedded in the epidermis.
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 epidermis consists of pyriform cells, which send richly branched processes to the superficial cuticle.
The epidermis has lost its connected epithelial character and its cilia, and the isolated cells have become sunk inwards retaining their S t- FIG.Advertisement
It is the first part which is cast off when the snake sheds its skin; this is done several times in the year, and the epidermis comes off in a single piece, being, from the mouth towards the tail, turned inside out during the process.
The cuticle is secreted by an epidermis in which no cell boundaries are to be seen; it sends out processes into the bristles.
Correlated with their life in dry situations, the bulk of the tissue is succulent, forming a water-store, which is protected from loss by evaporation by a thickly cuticularized epidermis covered with a waxy secretion which gives a glaucous appearance to the plant.
It readily dissolves the epidermis of the skin and many other kinds of animal tissue - hence the former application of the "sticks" in surgery.
The organs are developed as invaginations of the epidermis of the foot, and in the majority of the Protobranchia the orifice of invagination remains open throughout life; this is also the case in Mytilus including the common mussel.Advertisement
In effect (6) it traces the Turbellaria to small two-layered organisms consisting of an outer ciliated epidermis and a central syncytial tissue.
A pair of eyes lie dorsally and behind them is a b closed circlet, often pulled out into various shapes, of modified epidermis, to which an olfactory function has been attributed.
The tegmentum is pierced by numerous vertical ramified canals which contain epithelial papillae of the epidermis.
Plasmopara, &c. In Cystopus (Albugo) the "conidia" are abstricted in basipetal chain-like series from the ends of hyphae which come to the surface in tufts and break through the epidermis as white pustules.
Every leaf originates as a simple cellular papilla (fig 1), which consists of a development from the cortical layers covered by epidermis; and as growth proceeds, the fibro-vascular bundles of the stem are continued outwards, and finally expand and terminate in the leaf.Advertisement
The typical foliage leaf consists of several layers, and amongst vascular plants is distinguishable into an outer layer (epidermis) and a central tissue (parenchyma) with fibro-vascular bundles distributed through it.
The cells of the epidermis are very closely united laterally and contain no green colouring matter (chlorophyll) except in the pair of cells - guard-cells - which bound the stomata.
The outer wall, especially of the upper epidermis, has a tough outer layer or cuticle which renders it impervious to water.
The epidermis is continuous except where stomata or spaces bounded by specialized cells communicate with intercellular spaces in the interior of the leaf.
The lower epidermis is often of a dull or and pale-green colour.Advertisement
The upper epidermis is frequently smooth and shining, and sometimes becomes very hard and dense.
Many tropical plants present on the upper surface of their leaves several layers of compressed cells beneath the epidermis which serve for storage of water and are known as aqueous tissue.
In leaves having a very firm texture, as those of Coniferae and Cycadaceae, the cells of the parenchyma immediately beneath the epidermis are very much thickened and elongated in a direction parallel to the surface of the leaf, so as to be fibre-like.
These are collected in water, scraped over the edge of a shell to free them from adhering cellular tissue and epidermis, and more than once washed in a running stream, followed by renewed scraping till the desired purity of fibre is attained.
The structure of the epidermis of the under side of the leaf, with its contorted cells, is represented (X 160) in fig.
The body is composed of a large number of segments; the prostomium bears a pair of tentacles; the nervous system consists of a brain and longitudinal ventral nerve cords closely connected with the epidermis (without distinct ganglia), widely separated in Saccocirrus, closely approximated in Protodrilus, fused together in Polygordius; the coelom is well developed, the septa are distinct, and the dorsal and ventral longitudinal mesenteries are complete; the nephridia are simple, and open into the coelom.
When rubbed into the skin with such substances as alcohol or glycerine, which are absorbed, atropine is carried through the epidermis with them, and in this manner - or when simply applied to a raw surface - it paralyses the terminals of the pain-conducting sensory nerves.
It is based upon the fact that the histological differentiation of the epidermis of their root is that generally characteristic of Monocotyledons, whilst they have two cotyledons - the old view of the epiblast as a second cotyledon in Gramineae being adopted.
A,a,Female Heterodera schachtii Schmidt, breaking through the epidermis of a root; the head is still embedded in the parenchyma of the root.
Soon afterwards there is an accumulation under the epidermis of a serum derived from the dilated blood-vessels.
The seeds when placed in water for some time become coated with glutinous matter from the exudation of the mucilage in the external layer of the epidermis; and by boiling in sixteen parts of water they exude sufficient mucilage to form with the water a thick pasty decoction.
On the skin we have a thick epidermis through which microbes cannot pass, although if an entrance is obtained for them by a prick or cut they may readily grow in the tissues below and spread from them throughout the whole body.
In the same way, washing the skin with spirit would tend to harden the epidermis and thus prevent the entrance of microbes; and the application of an ointment to an abrasion would have a similar action.
The thickening of the epidermis in the hands and feet, which occurs from constant use, is nature's provision for meeting the extra wear to which these parts are subjected by much use; but pressure is apt to cause the defensive process to be carried too far, and to lead to corns, which give rise to much pain and annoyance.
In psoriasis the epidermis separates in flakes at various spots which have not been subjected to pressure, and to cure it ointment containing tar or other products of the dry distillation of wood is employed.
The germinating spores are not only able to pierce the leaves and stems of the potato plant, and so gain an entry to its interior through the epidermis, but they are also able to pierce the skin of the tuber, especially in young examples.
When terminal the awn has three fibro-vascular bundles, when dorsal only one; it is covered with stomate-bearing epidermis.
In the greater number of mammals the skin is more or less densely clothed with a peculiarly modified form of epidermis known as hair.
Other epidermic appendages are the horns of ruminants and rhinoceroses - the former being elongated, tapering, hollow caps of hardened epidermis of fibrous structure, fitting on and growing from conical projections of the frontal bones and always arranged in pairs, while the latter are of similar structure, but without any internal bony support, and situated in the middle line.
Callosities, or bare patches covered with hardened and thickened epidermis, are found on the buttocks of many apes, the breast of camels, the inner side of the limbs of Equidae, the grasping under-surface of the tail of prehensile-tailed monkeys, opossums; &c. The greater part of the skin of the onehorned Asiatic rhinoceros is immensely thickened and stiffened by an increase of the tissue of both the skin and epidermis, constituting the well-known jointed " armour-plated " hide of those animals.
The mature sporangium had a wall of a single layer of cells, which were larger towards the base, where they continued into the epidermis of the sporangiophore.
The pinnae, except in a few filmy forms, are thick; in Kaulfussia large pores derived from stomata occur in the epidermis.
Very usually (but not in the Onychophora = Peripatus) all the parapodia are plated with chitin secreted by the epidermis, and divided into a series of joints - giving the " arthropodous " or hinged character.
Two or three layers of cells inside the epidermis constitute the tissue of the ovary, and overlie somewhat similar layers which form the coats of the seed.
The nervous system lies in the epidermis, externally to the basementmembrane.
The epidermis, placed immediately within the cuticle, is composed of a single row of cells.
Beneath the epidermis is a thin cutis, which is followed by the muscular layers (external circular and internal longitudinal).
In each a differentiation takes place in the layers beneath the epidermis, by which an outer layer of small-celled tissue surrounds an inner portion of large cells.
The cuticularized epidermis, especially, is often thus preserved, and may be removed by the use of appropriate reagents and examined microscopically.
Stomata of the same structure as in Equisetum have been detected in the epidermis.
Ctenis has been incorrectly placed among the ferns by some authors, on account of the occurrence of supposed sporangia on its pinnae; but there is reason to believe that these so-called sporangia are probably nothing more than prominent papillose cells of the epidermis.
In addition to diffuse pigment (mostly in the epidermis), the skin contains granular pigment stored up r' in cells, the chromatophores, restricted to the cutis, which are highly mobile and send out r2 branches which, by contraction and expansion, may rapidly alter the coloration, most batrachians being in this respect quite comparable to the famous chameleons.
Weak solutions applied locally saponify fats, soften the epidermis, and thus act as slight stimulants and cleansers of the skin.
On a mucous membrane or a delicate skin it exerts an irritant action, which occurs more quickly than on a thickened epidermis, such as the scalp, and according to the strength and period of application there may result redness, a blister, or an ulcer.
The skin consist of two main layers, an outer layer called the epidermis and an inner layer called the dermis and an inner layer called the dermis.
Leather The epidermis is supported on the ridged surface of the underlying dermis is supported on the ridged surface of the underlying dermis.
The skin (see Figure 1) is composed of two major layers of tissue; the outer epidermis, and the inner dermis, and the inner dermis.
Retinol plumps skin, thickens the epidermis, improves texture and blood circulation and repairs the signs of sun damage.
Large numbers of neutrophils and lymphocytes penetrate the epidermis and entered the infected surface region.
The skin with hair follicles, hairy skin, e.g. on the scalp, has a thin epidermis and many sebaceous glands.
Grade 2 Partial thickness skin loss involving epidermis, dermis or both.
The skin (see Figure 1) is composed of two major layers of tissue; the outer epidermis, and the inner dermis.
Star shaped scales protect both the upper and the lower epidermis of the leaves.
The female mites are 0.3 mm long and feed within the human epidermis.
The laser passes through the upper epidermis leaving it undamaged.
The growing seedlings should be kept out of the full sun until the typical thick epidermis has appeared.
By " onion skin " does you mean onion epidermis or outer leaf of an onion bulb?
We are using a variety of different approaches to identify new markers of stem cells in human and mouse epidermis.
Some new characters based on the structure of the leaf epidermis are included.
Keratinocytes from the skin epidermis are functionally specialized to protect against the damaging effects of external agents, including ultraviolet (UV) light.
With small forceps, take the fragment of epidermis (with hairs) and pull it smoothly perpendicular to the stem.
This allows a narrow penetration peg to enter the leaf epidermis and colonize the tissue, later forming large bulbous infection hyphae.
During successive annual molts, the epidermis peels off with the old hair to reveal the bright new pelage underneath.
Salicyclic acid is not absorbed by the skin, but it rapidly kills the cells of the epidermis, without affecting the immediately subjacent cells of the dermis ("true skin").
The palisade layers of the mesophyll contain the larger number of chlorophyll grains (or corpuscles) while the absorption of carbon dioxide is carried on chiefly through the lower epidermis which is generally much richer in stomata.
In light skinned people, the melanin is concentrated deep in the epidermis, particularly in the stratum basale layer.
The similarity of action spectra for thymine dimers in human epidermis and erythema suggests that DNA is the chromophore for erythema.
Similar life-threatening consequences occur when large areas of necrotic epidermis are shed in toxic epidermal necrolysis, in adults usually due to drugs.
It contains nerves, hair follicles and supplies the epidermis with oils.
A small motor moves the needles up and down to penetrate and deposit ink in the superficial (epidermis) and middle (dermis) layers of the skin.
A mole (nevus) is a pigmented (colored) spot on the outer layer of the skin (epidermis).
Hair consists of the shaft and the root, which is anchored into a follicle beneath the epidermis.
Shaft-The portion of the hair that extends from the follicle and goes beyond the surface of the epidermis.
It can be caused by soaps, detergents, solvents, adhesives, fiberglass, and other substances that are able to directly injure the skin by breaking or removing the protective layers of the upper epidermis.
A first-degree burn causes redness and swelling in the outermost layers of skin (epidermis).
A second-degree burn involves redness, swelling and blistering, and the damage may extend beneath the epidermis to deeper layers of skin (dermis).
Lichenification is the medical term for a leather- or bark-like thickening of the outermost layer of skin cells (the epidermis) as a result of long-term scratching or rubbing of itching lesions.
Even conventional medicine has adopted this age-old concept of bringing healing to the sick via feeding the mucous membranes in the epidermis, in the respiratory track, in the digestive track and in the genitourinary system.
Therefore, with skin that is constantly renewing itself, you must make sure the artist can manipulate the epidermis to create the butterfly that you are hoping for.
In order to remove a tattoo, the ink inside your epidermis must be broken down or removed from the body.
If the epidermis is torn or damaged, bacteria can enter the body through the skin.
While the primary cause of wrinkles is the aging of the epidermis (the skin's under-layer), sun, other weather conditions, and even the facial expressions you use can contribute to those wrinkles!
New cells are produced in the top layer, or epidermis.
Additionally, the epidermis protects the body from infection and prevents excessive water loss.
Waste is removed and oxygen and nutrients are provided to the epidermis by the dermis.
As your skin ages the epidermis loses its ability to retain water resulting in fine lines and wrinkles.
This can include any place your epidermis reaches, including the lips, ears, scalp, and hands.
Heat rash that seeps sweat into the deeper layers of the epidermis cause larger blisters and a painful red rash.
These layers are the epidermis, dermis and the subcutaneous fat layer.
The epidermis skin layer is the outer, exposed lining.
Exfoliate your epidermis occasionally to aid the body in its effort to shed dead skin cells.
Freckles are tan, brown, or black spots that appear on the upper surface, or epidermis, of the skin.
Many species of Thysanoptera are known to be habitually parthenogenetic. The eggs are laid on the food-plant, those females possessed of an ovipositor cutting through the epidermis and placing their eggs singly within the plant-tissues; a single female may take five or six weeks to deposit all her eggs.
Doing this she bursts the epidermis of the rootlet, and her body projects into the surrounding earth.
In many forms its hyphae are particularly thick-walled, and may strikingly resemble the epidermis of a vascular plant.
This surface layer in the typically subaerial shoot of the sporophyte in Pteridophytes and Phanerogams is known as the epidermis, though the name is restricted by some writers, on account of developmental differences, to the surface layer of the shoot of Angiosperms, and by others extended to the surface layer of the whole plant in both these groups.
Sometimes the epidermis is considerably more developed by tangential division of its cells, forming a many-layered water-tissue.
The simplest type consists simply of a single elongated cell projecting above the general level of the lairs, epidermis.
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.
This tissue remains living and is usually formed quiti early, just below the epidermis, where it provides the first periphera support for a still growing stem or petiole.
In other cases the root structure of the stele continues up to the cotyledonary node, though the hypocotyl is still to be distinguished from the primary root by the character of its epidermis.
The epidermis in the stair and the surface layer of the root soon becomes differentiated froit the underlying tissue.
Throughout the Angiosperms the epidermis of the shoot originates from separate initials, which never divide tangentially, so that the young shoot is covered by a single layer of dividing cells, the dermatogen.
The branches of the stem arise by multiplication of the cells 01 the epidermis and cortex at a given spot, giving rise to a protuber ance, at the end of which an apical meristem is established.
Its most usual seat of origin in the stem is the external layer of the cortex immediately below the epidermis; in the root, the pericycle.
The opening and closing of the stomata is the result of variation in the turgidity 01 their guard cells, which is immediately affected by the condition of turgidity of the cells of the epidermis contiguous to them.
The only way in which their turgidity is modified is by the entry of water into them from the contiguous cells of the general epidermis and its subsequent withdrawai through the same channel.
In such leaves, there are a well-marked cuticle, a thick epidermis, a thick hypodermis at least on the upper side of the leaf, well-developed palisade tissue, and a poorly developed system of air-spaces.
The capillaries sometimes (in many leeches and Oligochaeta) extend into the epidermis itself.
Nervous system often imbedded in the epidermis.
The epidermis contains numerous groups of sense cells; beneath the epidermis there is rarely (Kynotus) an extensive connective tissue dermis.
They are minute worms with coloured oil drops (green, olive green or orange) contained in the epidermis.
The nervous system is embedded in the epidermis, and the pairs of ganglia are separated as in Serpula, &c.; each pair has a longish commissure between its two ganglia.
A further fact must be considered in deciding this question, which is the discovery of ramifying coelomic tubes, approaching close to, but not entering, the epidermis in the Polychaete Arenicola.
The fungus mycelium grows between the cuticle and the epidermis, the former being ultimately ruptured by numerous short branches bearing spores (conidia) by means of which the disease is spread.
The development of these organs, which in the Protonemertine are but grooves in the epidermis, not far removed from the similar cephalic slits of many Turbellaria, reaches its height in Drepanophorus.
Externally is a thin cuticle; this covers the epidermis, which consists of a syncytium with no cell limits.
These hollow roots terminate blindly in the dorsal epidermis of the collar, and place the nervous layer of the latter in direct connexion with the fibres of the nerve-tube.
The disease spreads by the mycelium growing ever the epidermis of the plant.
The chief peculiarities that distinguish Trematodes from their free-living allies, the Turbellaria, are the development of adhering organs for attachment to the tissues of the host; the replacement of the primitively ciliated epidermis by a thick cuticular layer and deeply sunk cells to ensure protection against the solvent action of the host; and (in one large order) a prolonged and peculiar life-history.
They have a layer of compact cells on their surface, but no true epidermis, and no stomata.
As the skin suffers abrasions or injuries, new skin cells are produced on the underside of the epidermis and are then pushed up to the surface.
In all green plants which have a special protective epidermis, the cortex of the shoot has to perform the primitive fundamental function of carbon assimilation.
The main assimilating tissue, on the other hand, is under the upper epidermis, where it is well illuminated, and consists of oblong cells densely packed with chloroplasts and with their long axes perpendicular to the surface (palisade tissue).
Usually the epidermis is immediately followed by the circular layer of muscles, and this by the longitudinal coat.
The clitellum consists of a thickening of the epidermis, and is of two forms among the Oligochaeta.
In the aquatic genera the epidermis comes to consist entirely of glandular cells, which are, however, arranged in a single layer.
In the earthworms, on the other hand, the epidermis becomes specialized into several layers of cells, all of which are glandular.
We have thus the replacement of a spermatheca, corresponding to those of the remaining families of Oligochaeta, and derived, as is believed, from the epidermis, by a structure performing the same function, but derived from the mesoblastic tissues, and with a cavity which is coelom.
Salicyclic acid is not absorbed by the skin, but it rapidly kills the cells of the epidermis, without affecting the immediately subjacent cells of the dermis.
In one family, the Ptychoderidae, the medullary tube of the collar is connected at intermediate points with the epidermis by means of a variable number of unpaired outgrowths from its dorsal wall, generally containing an axial lumen derived from and in continuity with the central canal.
Both male and female gonads consist of more or less lobulated hollow sacs connected with the epidermis by short ducts.
The female burrows in the epidermis much as the female trap-door spider burrows in turf in order to make a nest in which to rear her young.
One chief means employed by nature in accomplishing this object is the investment of those parts of the organism liable to be attacked with an armour-like covering of epidermis, periderm, bark, &c. The grape is proof against the inroads of the yeastplant so long as the husk is intact, but on the husk being injured the yeast-plant finds its way into the interior and sets up vinous fermentation of its sugar.
The root of the French vine is attacked by the Phylloxera, but that of the American vine, whose epidermis is thicker, is protected from it.
So long as the epidermis of animals remains sound, disease germs may come in contact with it almost with impunity, but immediately on its being fissured, or a larger wound made through it, the underlying parts, the blood and soft tissues, are attacked by them.
Then come the glandular surface (C), which is formed of smooth polished epidermis with numerous glands that secrete the fluid contents of the pitcher, and finally the detentive surface (D), of which the cells are produced into long and strong bristles which point A FIG.
In relation to its characteristic function of protection, the epidermis, which, as above defined, consists of a single layer of cells has typically thickened and cuticularized outer walls.
In a second type they are situated at the ends of tracheal strands and consist of groups of richly protoplasmic cells belonging to the epidermis (as in the leaves of many ferns), or to the subjacent tissue (the commonest type in flowering plants); in this last case the cells in question are known as epithem.
The other type is called endctropic. The fungal filaments either penetrate the epidermis of the root, or enter it from the stem and ramify in the interior.
In Lanice conchilega the posterior series of nephridia are connected by a thick longitudinal duct, which seems to be seen in its most reduced form in Owenia, where a duct on each side runs in the epidermis, being in parts a groove, and receives one short tubular nephridium only and occupies only one segment.
The body wall consists of an epidermis which secretes a delicate cuticle and is only ciliated in Aeolosoma, and in that genus only on the under surface of the prostomium.
In favour of seeing in the lateral trunks and their branches a vascular system, is the contractility of the former, and the fact of the intrusion of the latter into the epidermis, matched among the Oligochaeta, where undoubted blood capillaries perforate the epidermis.
Beneath the epidermis is a longitudinal layer of muscle-fibres which are separated into four distinct groups by the dorsal, ventral and lateral areas; these are occupied by a continuation of the epidermic layer; in the lateral areas run two thin-walled tubes with clear contents, which unite in the anterior part of the body and open by a pore situated on the ventral surface usually about a quarter or a third of the body length from the anterior end.
The surface layer of the root, sometimes included under tht term epidermis, is fundamentally different from the epidermis of the stem.