Theca of follicle

Theca of follicle

Infobox Anatomy
Name = PAGENAME
Latin = theca folliculi
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Caption = Mature late-stage tertiary (Graffian) follicle


Caption2 = Early folliculogenesis from primordial to early tertiary.
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DorlandsPre = t_07
DorlandsSuf = 12801620
The theca folliculi comprise a layer of the ovarian follicles. They appear as the follicles become tertiary follicles.

The theca are divided into two layers, the theca interna and the theca externa.

Theca interna

Theca interna cells express receptors for luteinizing hormone, which when activated will stimulate the production of androstenedione from cholesterol by the enzyme desmolase. Androstenedione ultimately gives the granulosa the precursor for estrogen manufacturing.

After rupture of the mature ovarian follicle, the theca interna cells differentiate into the theca lutein cell of the corpus luteum. These cells secrete progesterone.

Theca externa

The theca externa is the outer layers of the theca folliculi. It contains contain abundant collagen and is mainly supportive.

ee also

* theca
* thecoma

External links

*
* - "Mammal, canine ovary (LM, High)"
* - "Mammal, bovine ovary (LM, Medium)"
* - interna
* - externa
*
* [http://www.trinity.edu/rblyston/MicroA/Lectures/L39-html/sld016.htm Slide at trinity.edu]


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Look at other dictionaries:

  • Theca — A theca (plural thecae) refers to any case, covering, or sheath. In botany, the theca of an angiosperm is half of the anther. An anther and its filament form together a typical (or filantherous) stamen, part of the male floral organ.Each anther… …   Wikipedia

  • theca folliculi — theca fol·lic·u·li fə lik yə .lī n the outer covering of a graafian follicle that is made up of the theca externa and theca interna * * * an envelope of condensed connective tissue surrounding a vesicular ovarian follicle, comprising an internal… …   Medical dictionary

  • theca — A sheath or capsule. [G. theke, a box] t. cordis SYN: pericardium. t. externa SYN: tunica externa thecae folliculi. t. folliculi the wall of a vesicular ovarian follicle. SEE ALSO: tunica externa, tunica interna thecae …   Medical dictionary

  • follicle — 1. A more or less spherical mass of cells usually containing a cavity. 2. A crypt or minute cul de sac or lacuna, such as the depression in the skin from which the hair emerges. SYN: folliculus [TA]. [L. folliculus, a small sac, dim. of follis, a …   Medical dictionary

  • theca — n. a sheathlike surrounding tissue. For example, the theca folliculi is the outer wall of a Graafian follicle …   The new mediacal dictionary

  • theca — [ θi:kə] noun (plural thecae si:) 1》 Anatomy the loose sheath enclosing the spinal cord. 2》 Anatomy the outer layer of cells of a Graafian follicle. 3》 Zoology a cup like or tubular structure containing a coral polyp. 4》 Botany each of the lobes… …   English new terms dictionary

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  • Oogenesis — Oogenesis, ovogenesis or oögenesis (  /ˌoʊ …   Wikipedia

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