theca


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Related to theca: theca folliculi

the·ca

 (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.

[Latin thēca, case, receptacle, from Greek thēkē; see dhē- in Indo-European roots.]

the′cal (-kəl) adj.

theca

(ˈθiːkə)
n, pl -cae (-siː)
1. (Botany) botany an enclosing organ, cell, or spore case, esp the capsule of a moss
2. (Zoology) zoology a hard outer covering, such as the cup-shaped container of a coral polyp
[C17: from Latin thēca, from Greek thēkē case; related to Greek tithenai to place]
ˈthecal, ˈthecate adj

the•ca

(ˈθi kə)

n., pl. -cae (-sē).
1. a case or sheath enclosing an animal organ, structure, etc., as the horny covering of an insect pupa.
2. a sac, cell, capsule, or sporangium of a plant or mushroom.
[1655–65; < Latin thēca < Greek thḗkē case, cover, akin to tithénai to place, put]
the′cal, the′cate (-kɪt, -keɪt) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.theca - a case or sheath especially a pollen sac or moss capsule
covering, natural covering, cover - a natural object that covers or envelops; "under a covering of dust"; "the fox was flushed from its cover"
2.theca - outer sheath of the pupa of certain insects
sheath, case - an enveloping structure or covering enclosing an animal or plant organ or part
Translations

the·ca

n. teca, envoltura o capa que actúa esp. como protectora de un órgano.
References in periodicals archive ?
Zona radiate were irregular in appearance, theca cells were slightly enlarged and basal membrane disintegrated (Fig.
The effect of short-term treatment of ewes with either intravenous glucose or a supplement of soya and mize during the luteal phase on the number of follicles and the AMPK signaling pathway in granulosa and theca cells.
The goblet cell morphology is shaped by the distended theca containing the mucin granules located below the apical membrane.
Increased disruption of sperm plasma membrane at sperm immobilization promotes dissociation of perinuclear theca from sperm chromatin after intracytoplasmic sperm injection in pigs.
Increased lipid vacuoles were determined in the Theca cells of the multilaminar primary follicles (Figure 8c).
Hyperthecosis is a condition where ovarian stroma possesses nests of luteinized theca cells that produce large amounts of androgens [10].
Under control of high pulsatile release of LH, the theca cells upregulate the expression of steroidogenic acute regulatory protein (StAR), P450 sidechain cleavage (P450scc), 3[beta]-hydroxysteroid dehydrogenase (3[beta]-HSD), and cytochrome P450c17 (CYP17) and increase steroidogenic activity in the theca cells [22], thereby producing androstenedione.
Moreover, ovary images in normal animals fully correspond with expected characteristics (e.g., antral cavity, corpus luteum, oocyte, granulosa cells, and internal and external theca cells) (Figure 3(b)), whereas those from PCOS rats displayed dysfunctional characteristics compatible with a large antral cavity in a cystic follicle and showed decreased granulosa and theca (internal and external) cell layers (Figure 3(b)).
Stromal embedded follicles including primordial and primary follicles containing the developing oocytes surrounded by granulosa and undifferentiated theca layers and few atretic follicles were observed in the ovaries of normal hens (Figure 2(a)).