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

(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 ?
Flowers sessile, buds cylindrical; epicalyx green; corolla 6merous, 0.3-0.5 cm in length, reddish-cream, valvate; stamens-6, majors 0.5 X 0.1 cm, minors 0.3 X 0.1 cm, included; ovary obovate, 0.2 cm in length; style cylindrical, 0.3-0.4 cm in length, staminodes filiform with compressed thecae. Fruit elliptical, 0.8 cm in length, reddish when mature.
1 and 2)that dominates the floral display while 5-6 stamens are fertile and produce thecae containing pollen.
1.5 mm longo; thecae 1.5 mm longae; apendices antherarum ovatae ca.
Twenty-nine elongated (36.2%), 21 flattened (26.2%), 20 hemispherical (25%) and 10 spherical (12.5%) thecae taxa were recorded, with the highest diversity found in species with elongated shells.
The origin, place of manufacture, and identity of the sculptors of both the thecae and the marble anthropoid sarcophagi are discussed in chapter two, while the origin and place of manufacture of the clay anthropoid sarcophagi are discussed in chapter four.
There are large colonies of earlier Silurian retiolitids with no appendix, containing about 80 pairs of thecae with small siculae, whereas some of the youngest retiolitids possess a finite tubarium with a large sicula and as few as three thecae (Kozlowska-Dawidziuk 2004, fig.
similis 5b R1, R2 and R3 equally or subequally distanced, a list is present behind R3 6a Cells medium-sized, 45-60 [micron]m long, with areolated thecae, LSL having the same width in its anterior and posterior parts (6) Dinophysis ovum 6b Cells small, 28-38 [micron]m long, with smooth thecae, LSL increasing in width from R1 backward (7) Dinophysis cf.
Flores hermaphroditi circa 10 (5-12); corollae tubulosae 5-denticulatae; filamenta antherarum in parte superiore distincta, thecae oblongoovatae base obtusae; styli glabri appendicibus elongati oblongi ad apicem triangulares.