| tunica externa thecae folliculi | <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) |
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| tunica interna thecae folliculi | <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) |