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Qu'est-ce (qui) est tunica externa thecae folliculi - définition
ANATOMICAL ENTITY
Tunica externa thecae folliculi
Theca externa
The theca externa is the outer layer of the theca folliculi. It is derived from connective tissue, the cells resembling fibroblasts, and contains abundant collagen.
Tunica externa
![Transverse section through a small [[artery]] and [[vein]] of the [[mucous membrane]] of the [[epiglottis]] of a child. (Tunica adventitia is at 'a')](https://commons.wikimedia.org/wiki/Special:FilePath/Gray448.png?width=200 "Transverse section through a small [[artery]] and [[vein]] of the [[mucous membrane]] of the [[epiglottis]] of a child. (Tunica adventitia is at 'a')")
OUTER LAYER OF BLOOD VESSEL
Tunica adventitia; Adventitia externa; External coat; Tunica adventitia (vessels); Tunica externa vasorum; Tunica adventitia vasorum; Tunica externa (vessels)
The tunica externa (New Latin "outer coat"), also known as the tunica adventitia (New Latin "additional coat"), is the outermost tunica (layer) of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and, in arteries, is supported by external elastic lamina.
Theca interna
Theca interna cells express receptors for luteinizing hormone (LH) to produce androstenedione, which via a few steps, gives the granulosa the precursor for estrogen manufacturing.
Wikipédia
Theca externa
The theca externa is the outer layer of the theca folliculi. It is derived from connective tissue, the cells resembling fibroblasts, and contains abundant collagen. During ovulation, the surge in luteinizing hormone increases cAMP which increases progesterone and PGF2α production. The PGF2α induces the contraction of the smooth muscle cells of the theca externa, increasing intrafollicular pressure. This aids in rupture of the mature oocyte, or immature oocyte at the germinal vesicle stage in the canine, along with plasmin and collagenase degradation of the follicle wall.
