Theca externa
From Wikipedia, the free encyclopedia
| Theca externa | |
|---|---|
| Latin | tunica externa thecae folliculi |
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.[1] 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.
References
- ↑ Sadler, T. W. (2008). Langmans embryologi (2. ed.). Copenhagen: Munksgaard Danmark. p. 33. ISBN 9788762805088.
External links
- BU Histology Learning System: 14805loa
- Organology at UC Davis Reproductive/mammal/ovary2/ovary5 - "Mammal, canine ovary (LM, High)"
- Organology at UC Davis Reproductive/mammal/ovary5/ovary6 - "Mammal, bovine ovary (LM, Medium)"
- UIUC Histology Subject 373 - externa
- Anatomy Atlases - Microscopic Anatomy, plate 13.249
- Slide at trinity.edu
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