germinal epithelium


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epithelium

 [ep″ĭ-the´le-um] (pl. epithe´lia) (Gr.)
the cellular covering of internal and external surfaces of the body, including the lining of vessels and other small cavities. It consists of cells joined by small amounts of cementing substances. Epithelium is classified into types on the basis of the number of layers deep and the shape of the superficial cells.
ciliated epithelium epithelium bearing vibratile, hairlike processes (cilia) on its free surface.
columnar epithelium epithelium whose cells are of much greater height than width.
cuboidal epithelium epithelium whose cells are of approximately the same height and width, and appear square in transverse section.
germinal epithelium thickened peritoneal epithelium covering the gonad from earliest development; formerly thought to give rise to germ cells.
glandular epithelium that composed of secreting cells.
pigmentary epithelium (pigmented epithelium) that made of cells containing granules of pigment.
sense epithelium (sensory epithelium) neuroepithelium (def. 1).
simple epithelium that composed of a single layer of cells.
squamous epithelium that composed of flattened platelike cells.
stratified epithelium epithelium made up of cells arranged in layers.
transitional epithelium a type characteristically found lining hollow organs, such as the urinary bladder, that are subject to great mechanical change due to contraction and distention; originally thought to represent a transition between stratified squamous and columnar epithelium.

ger·mi·nal ep·i·the·li·um

a cuboidal layer of peritoneal epithelium covering the gonads, previously thought to be the source of germ cells, hence the name.

ger·mi·nal ep·i·the·li·um

(jĕr'mi-năl ep'i-thē'lē-ŭm)
A cuboidal layer of peritoneal epithelium covering the gonads, formerly thought to be the source of germ cells.

germinal epithelium

a cell layer found on the outer surface of the vertebrate OVARY and lining the seminiferous tubules of the TESTIS, which gives rise to follicle cells in females and to spermatogonia in males. In males it also produces SERTOLI CELLS which nourish the developing sperms.
References in periodicals archive ?
4a-e; 11a), the ovarian germinal epithelium consists of somatic NPs and germ cells, including AOs; conical or gum drop-shaped RVPOs; and, occasionally, residual degenerating primary oocytes (DPOs).
Thus, in response to appropriate environmental cues such as daylength, temperature, or biomass load in the surrounding seawater, a GSS discharged by cells in the ovaries or adjacent tissues could trigger the detachment of follicles, perhaps by causing constrictions at sites where follicles connect to the germinal epithelium. Such a GSS-induced pathway would presumably take longer to detach follicles than does mechanical disruption, and could be fully replaced by the maceration procedure during in vitro trials.
The mean height of germinal epithelium was 94.45 mm (SD+-2.546) in the control group while in the experimental group it was 78.54 mm (SD+-2.46).
Morphometric evaluation of seminiferous tubules revealed that in summer and rainy season they had their higher diameter, circumference and germinal epithelium height than in autumn and winter (Figs.
When analyzing the histology of gonads and germinal epithelium of the seminiferous tubules of the control group of mice CF1 are observed that they present a normal cytology in relation to the different phases of the spermatogenesis, showing the cytomorphologics changes from spermatogonia at the formation and liberation of the spermatozoa in the light of tubule (1A).
For each animal and case 50 cross sections were measured and evaluated for two histometric characteristics of the seminiferous tubules: height of the germinal epithelium (EH) and diameter of the tubules (TD).
The thickness of the germinal epithelium was higher than the luminal diameter of the seminiferous tubules in monsoon II and winter seasons than the other seasons (Figs.