stratum

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stratum

 [stra´tum, strat´um] (L.)
a sheetlike mass of tissue; see also lamina and layer.
stratum basa´le the deepest layer of the epidermis, composed of a single layer of basophilic cells. Called also basal layer of epidermis.
stratum cor´neum the outer horny layer of the epidermis, consisting of cells that are dead and desquamating. Called also horny layer.
stratum germinati´vum
1. the stratum basalis and stratum spinosum considered together; called also malpighian layer.
2. the lower layer of the nail, from which the nail grows; called also germinative layer.
stratum granulo´sum the cell layer of the epidermis lying between the stratum lucidum and the stratum spinosum. Called also granular layer.
1. the deep layer of the cortex of the cerebellum.
2. the layer of follicle cells lining the theca of the vesicular ovarian follicle; called also granular layer.
stratum lu´cidum the clear translucent layer of the epidermis, just beneath the stratum corneum. Called also clear layer.
stratum spino´sum the layer of the epidermis between the stratum granulosum and stratum basalis, marked by the presence of prickle cells; called also spinous layer and prickle-cell layer.

strat·um

, gen.

stra·ti

, pl.

stra·ta

(strat'ŭm, tă; strā'tŭm; tī), The correct plural of this word is strata, not strati or stratae.
One of the layers of differentiated tissue, the aggregate of which forms any given structure, such as the retina or the skin.
See also: lamina, layer.
[L. sterno, pp. stratus, to spread out, strew, ntr. of pp. as noun, stratum, a bed cover, layer]

stratum

/stra·tum/ (strat´um) (stra´tum) pl. stra´ta   [L.] a layer or lamina.
stratum basa´le  basal layer: the deepest layer, as of the endometrium or epidermis.
stratum compac´tum  compact layer of endometrium: the sublayer of the stratum functionale facing the interior of the uterus and containing the necks of the uterine glands.
stratum cor´neum  horny layer: the outermost layer of the epidermis, consisting of dead and desquamating cells.
stratum functiona´le  functional layer of endometrium: the layer of endometrium facing the uterine lumen, overlying the stratum basale; subdivided into the stratum compactum and stratum spongiosum. Its cells are cast off at menstruation and parturition. It is called the decidua during pregnancy.
stratum germinati´vum  germinative layer: the stratum basale and stratum spinosum of the epidermis considered as a single layer; the term is sometimes used to denote only the stratum basale.
stratum granulo´sum  granular layer.
1. the layer of epidermis between the stratum lucidum and stratum spinosum.
2. the layer of follicle cells lining the theca of the vesicular ovarian follicles.
stratum lu´cidum  clear layer: in the epidermis, the clear translucent layer just beneath the stratum corneum.
stratum spino´sum  spinous or prickle cell layer: in the epidermis, the layer between the stratum granulosum and stratum basale, characterized by the presence of prickle cells.
stratum spongio´sum  spongy layer of endometrium: the sublayer of the stratum functionale underlying the stratum compactum; it contains the tortuous portions of the uterine glands.

stratum

(strā′təm, străt′əm)
n. pl. stra·ta (-tə) or stra·tums
Biology A layer of tissue: the epithelial stratum.

stra′tal (strāt′l) adj.

stratum

[strā′təm, strat′əm] pl. strata
Etymology: L, layer
a uniformly thick sheet or layer, usually associated with other layers, such as the stratum basale of the epidermis.

stra·tum

, pl. strata (strā'tŭm, -tă)
One of the layers of differentiated tissue, the aggregate of which forms any given structure, such as the retina or the skin.
See also: lamina, layer

stra·tum

, pl. strata (strā'tŭm, -tă)
One of the layers of differentiated tissue, the aggregate of which forms any given structure.

stratum

pl. strata [L.] a sheetlike mass of tissue of fairly uniform thickness; distinct layers making up various tissues or organs, as of the skin, brain, retina.

stratum avasculosum
the avascular stratum in the margin of the iris.
stratum basale
the mitotically active, basal layer of the epidermis, consisting of columnar to cuboidal keratinocytes on a basement membrane.
stratum corneum
the outer horny layer of the epidermis, consisting of cells that are non-nucleated, keratinized and desquamating.
stratum germinativum
in the epidermis, located between the stratum basale and the stratum granulosum. Together with the basal layer, called the malpighian layer. Called also germinative layer.
stratum granulosum
1. the layer of cells between the stratum lucidum and the stratum spinosum of the skin, very thin and not always present. Called also the granular layer.
2. the deep layer of the cortex of the cerebellum.
3. the layer of follicle cells lining the theca of the vesicular ovarian follicle. Called also granular layer.
stratum lamellatum
laminae of the hoof corium.
stratum lucidum
the translucent layer of the skin just beneath the stratum corneum. Called also clear layer. Present in the epidermis of the planum nasale of several species and footpads of carnivores.
stratum spinosum
the layer of the epidermis between the stratum granulosum and the stratum basale, marked by the presence of prickle cells; called also spinous layer and prickle-cell layer.
stratum tectorium
the layer of horny scales claimed to exist on the surface of the horse's hoof that gives it the smooth glossy appearance.
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