theca

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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

/the·ca/ (the´kah) pl. the´cae   [L.] a case or sheath.the´cal
theca folli´culi  an envelope of condensed connective tissue surrounding a vesicular ovarian follicle, comprising an internal vascular layer (tunica interna) and an external fibrous layer (tunica externa) .

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.

theca

[thē′kə] pl. thecae,
a sheath or capsule, such as the theca cordis or pericardium.

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.

theca

pl. thecae [L.] a case or sheath.

theca cell
an epithelioid cell of the corpus luteum.
theca cordis
pericardium.
theca folliculi
an envelope of condensed connective tissue surrounding a vesicular ovarian follicle, comprising an internal vascular layer (theca interna) and an external fibrous layer (theca externa).
granulosa theca cell tumor
may secrete estrogen and progesterone in dogs and cause persistent or irregular estrus, alopecia, enlargement of nipples and vulva. Uterine changes range from cystic endometrial hyperplasia to pyometra.
References in periodicals archive ?
Gothograptus nassa has the largest number of thecae of any species of the Gothograptus lineage, up to 18 pairs.
Neogothograptus alatiformis Lenz & Kozlowska-Dawidziuk, 2004 is the smallest form of this genus with only three thecae and a well-developed, dense reticulum, especially in mature colonies.
The fertile stamen develops from the inner stamen whorl and is petaloid with the thecae located on the adaxial surface and the connective extending above the region of pollen production.
1 and 2)that dominates the floral display while 5-6 stamens are fertile and produce thecae containing pollen.
The apical appendages are neither constricted nor demarcated from the thecae, as commonly occurs in the subfamily Asteroideae, except in Adenocaulon and Eriachaenium (Fig.
tubular four-lobed corollas, very short anther tails, anther collar, anther appendages constricted and demarcated from the thecae, and spheroidal, small pollen grains.
5 mm longae anguste tubulares superne parum infundibulares, lobis triangularis glanduliferis; filamenta antherarum in parte superiore distincta, thecae ca.
Although they have four pollen sacs, organized into two thecae, each theca opens by a single valve, which is hinged on the ventral side of the theca (Fig.
Corolline corona often present as small lobes in throat or ridges behind anthers; anthers sometimes with short, sterile apical appendages (Diplorhynchus, Dyera) or with short sterile appendages at apex and thecae bases (Pycnobotrya); leaves opposite or whorled; plants of the Old World Melodineae
The anther thecae can be separated by a broad connective or confluent, symmetric or asymmetric, and be parallel or divergent to various degrees at maturity.