Theca

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Related to Thecal cells: Granulosa cells

theca

[′thē·kə]
(anatomy)
The sheath of dura mater which covers the spinal cord.
(botany)
A moss capsule.
A pollen sac.
(histology)
The layer of stroma surrounding a Graafian follicle.
(invertebrate zoology)
The test of a testate protozoan or a rotifer.

Theca

 

various types of sheath in animals and plants:

(1) A cell wall in certain amoebae (thecamoebae).

(2) A chitinoid membrane in hydroid polyps; hence the division into the suborders Thecaphora and Athecata.

(3) The connective tissue surrounding ovarian follicles in vertebrates (theca folliculi).

(4) A tooth socket in the jawbone of mammals and crocodiles.

(5) A capsule for spores in mosses.

(6) The valve of a silicified test; in diatoms, the upper half is the epitheca and the lower half, the hypotheca.

(7) The pollen sac of an anther in angiosperms.

References in periodicals archive ?
Moreover, both gonads contain interstitial cells (Leydig and thecal cells, respectively).
primary 300-530 Yolk globules appear between the yolk yolk vesicles and increase in number; both granulosa and thecal cell layers are clearly observed.
The TGF-[beta] superfamily factors, in particular GDF9 and BMP15, play a critical role in ovarian architecture and fertility, being essential for the proper follicular growth and development, as well as for the formation, growth and function of granulosa and thecal cells.
the oocytes and the differentiation and proliferation of ovarian somatic cells, or granulosa and thecal cells (28).
Unlike the granulosa cell layer, the layer of thecal cells becomes richly supplied with capillaries.
Thecal cells (luteinized cells within the stroma) produce estrogen, and if present in large enough quantities within a granulosa cell tumor, can cause elevated serum estradiol levels.