theca


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Related to theca: theca folliculi

theca

 [the´kah] (L.)
a case or sheath. adj., adj the´cal.
theca cor´dis pericardium.
theca folli´culi an envelope of condensed connective tissue surrounding a vesicular ovarian follicle; it is composed of an internal vascular layer (theca interna) and an external fibrous layer (theca externa).

the·ca

, pl.

the·cae

(thē'kă, thē'sē),
A sheath or capsule.
[G. thēkē, a box]

theca

(thē′kə)
n. pl. the·cae (-sē′, -kē′)
A case, covering, or sheath, such as the covering of the pollen sacs of an anther or the thick cell wall of certain dinoflagellates.

the′cal (-kəl) adj.

the·ca

, pl. thecae (thē'kă, -sē)
A sheath or capsule.
[G. thēkē, a box]

theca

A casing, outer covering or sheath.

theca

  1. a sheath or case.
  2. the protective sheath surrounding the GRAAFIAN FOLLICLE.
  3. an obsolete term for ASCUS.
References in periodicals archive ?
The theca of post-ovulatory follicles was continuous with the epithelial cell layer lining the ovigerous lamellae.
Additionally, in the present study, BMP15 and GDF9 were also expressed in the pellet of cells, where granulosa and theca cells were expresed.
AR has been primarily localized in the theca interna cells of preantral follicles, granulosa cells of preantral and antral follicles, and both theca and granulosa cells of dominant follicles [104].
Very few macrophages are seen in the stroma and theca layer of the stromal embedded follicle.
Recent studies have shown that HGF can suppress apoptosis in ovarian granulosa cells and mediates the positive feedback loop between theca cells and granulosa cells, which can promote the dramatic cell growth required for folliculogenesis [41, 42].
Meantime, this can lead to abnormal proliferation or excessive apoptosis of follicular cells such as the high LH dependent theca cellular proliferation [67] and follicular atresia induced granulosa cell inactivation [68-70] in PCOS and depletion of oocytes pool in premature ovarian failure [71].
Hyperreactio luteinalis (HL) refers to moderate to marked cystic enlargement of the ovaries due to multiple benign theca lutein cysts.
However, many studies indicate that GDF9 and BMP15 have critical roles in ovarian architecture of most species and are essential factors for adequate follicular development, interfering considerably in the function, growth and formation of granulosa and theca cells during the growth of the follicle (Vitt and Hsueh, 2001; Otsuka et al., 2011).
Expression of this gene has been reported in testes, ovarian theca cells, and H295 adrenal carcinoma cells (19).
A layer of cells (Theca folliculi) was first appearing with spindle-shaped nucleoli and was enveloped of each oocyte (Fig.3, e).