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Theca
(redirected from Theca cells)

    Also found in: Dictionary/thesaurus, Medical, Legal, Wikipedia 0.01 sec.
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.
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For this work, the researchers started with theca cells, which form the outer coating of the follicle that holds the egg and produces a precursor to oestrogen.
Artificial ovary 'turns immature human egg into mature one' by Asian News International
Production of insulin-like growth factor-I by granulosa cells but not theca cells is hormonally responsive in cattle".
Isolation and cloning of cDNA for both IGF-1 R and FSHR genes from ... by Zoheir, Khairy M.A.; Xiang, Li; Din M., Moaeen-ud-; Liu, Yun; Yang, Li-Guo / International Journal of Biotechnology & Biochemistry
The most common causes are gestational trophoblastic disease (hydatidiform mole or choriocarcinoma), hyperstimulation secondary to infertility treatments, and extensive luteinization of theca cells, usually in a multiple gestation.
CT and MRI of adnexal masses by Westphalen, Antonio Carlos A.; Qayyum, Aliya / Applied Radiology
 
 
 
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