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单词 theca externa
释义

> as lemmas

theca externa
b. In full theca folliculi. A layer of hormonally active cells enclosing a tertiary (vesicular) or a mature (Graafian) ovarian follicle, consisting of an inner, vascular layer ( theca interna) and an outer, fibrous layer ( theca externa). [So named in German by C. E. von Baer ( Über Entwickelungsgeschichte der Thiere (1837) II. iii. xv. 23).]
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the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > ovum or ootid > Graafian follicle, etc.
corpus luteum1788
ovarian follicle1834
Graafian follicle1841
theca folliculi1857
corona radiata1869
stigma1890
1857 R. Dunglison Med. Lexicon (rev. ed.) 400/1 Folliculi Graafiani, small spherical vesicles in the stroma of the ovary, which have at least two coats; the outer termed ovicapsule..and theca folliculi.
1859 Todd's Cycl. Anat. & Physiol. V. 551/1 The external or vascular coat [of the Graafian follicle]..constitutes the tunic of the ovisac of Barry, the tunica fibrosa, S. theca folliculi of Baer.
1929 Anatomical Rec. XLIII. 242 The cells of either the granulosa or the theca have become luteinized.
1930 A. A. Maximow & W. Bloom Text-bk. Histol. xxxii. 640 There is no sharp limit between the two layers of the theca or between the theca externa and the stroma.
1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XI. 474/1 A growing follicle has several layers of follicular cells, or granulosa cells.., and a surrounding capsule of connective tissue, the theca folliculi.
1978 D. B. Wilson & E. Wilson Human Anat. xvi. 388/2 The inner layer is the theca interna, which secretes the hormone estrogen into the vascular system.
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