| thebesian circulation | The system of smaller veins in the myocardium. (05 Mar 2000) |
|---|---|
| thebesian foramina | <anatomy> A number of fossae in the wall of the right atrium, containing the openings of minute intramural veins. Synonym: foramina venarum minimarum cordis, foramina of the smallest veins of heart, Lannelongue's foramina, thebesian foramina, Vieussens' foramina. (05 Mar 2000) |
| thebesian valve | A delicate fold of endocardium at the opening of the coronary sinus into the right atrium. Synonym: valvula sinus coronarii, coronary valve, thebesian valve. (05 Mar 2000) |
| thebesian veins | Synonym: venae cordis minimae. (05 Mar 2000) |
| Thebesius, Adam | <person> German physician, 1686-1732. See: thebesian foramina, thebesian valve, thebesian veins. (05 Mar 2000) |
| theca | Origin: L, fr. Gr. A case to put anything in. See Tick a cover. 1. A sheath; a case; as, the theca, or cell, of an anther; the theca, or spore case, of a fungus; the theca of the spinal cord. 2. <zoology> The chitinous cup which protects the hydranths of certain hydroids. The more or less cuplike calicle of a coral. The wall forming a calicle of a coral. Source: Websters Dictionary (01 Mar 1998) |
| theca cell tumour | A sex cord-stromal tumour of the postmenopausal ovary that is yellow, large, and unilateral, composed of fascicles of lipid-rich spindle cells interspersed with collagen, reticulin fibres, and hyaline plaques. Thecomas and other oestrogen-producing tumours (e.g., granulosa cell tumours) may induce adenomatous hyperplasia of the endometrium or well-differentiated endometrial carcinoma in 3%-20% of the cases. (12 Dec 1998) |
| theca cells | The connective tissue cells of the graafian follicle. (12 Dec 1998) |
| theca cells of stomach | Cell's lining the gastric surface and foveolae; a glycoprotein product at the apical end of each cell is secreted and forms a mucous protective film. Synonym: theca cells of stomach. (05 Mar 2000) |
| theca cordis | <anatomy> A double membranous sac which envelops and protects the heart. The layer in contact with the heart is referred to as the visceral layer, the outer layer in contact with surrounding organs is the parietal pericardium. In between the two layers is the pericardial space. (27 Sep 1997) |
| theca externa | <embryology> The external fibrous layer of the theca of a well-developed vesicular ovarian follicle; the cells and fibres are arranged in a concentric fashion. Synonym: theca externa. (05 Mar 2000) |
| theca folliculi | The wall of a vesicular ovarian follicle. See: tunica externa, tunica interna thecae folliculi. (05 Mar 2000) |
| theca interna | <embryology> The inner cellular and vascular layer of the vesicular ovarian follicle. There is evidence that the epithelioid cells produce oestrogen and contribute to the formation of the corpus luteum after ovulation. Synonym: theca interna. (05 Mar 2000) |
| theca interna cone | The conical thickening of thecal cells of an ovarian follicle with its apex pointed toward the surface. (05 Mar 2000) |
| theca lutein cell | A steroid secretory cell of the corpus luteum that comes from the theca interna of the ovarian follicle at the time of ovulation. Synonym: paraluteal cell, paralutein cell. (05 Mar 2000) |