Postovulatory changes in the theca folliculi of the trout
1978
Szollosi, Daniel | Jalabert, Bernard | Breton, Bernard | Laboratoire de physiologie des poissons ; Institut National de la Recherche Agronomique (INRA)
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Afficher plus [+] Moins [-]anglais. At time of ovulation the cells composing the theca folliculi of trout are morphologicallysmooth muscle like.The physiological behaviour of this tissue confirms its smoothmuscle nature. Following ovulation a further cellular transformation and differentiationtakes place : within 12-24 hrs after ovulation the theca cells start phagocytozing the adjacentcollagen. Bundles of collagen are partially surrounded at first by cellular processesof the thecal cells while finally small bundles of collagen are interiorized. The number ofcollagen fibers per phagocytotic vesicle varies from one to many. The bundles can berecognized morphologically until 72 hrs after ovulation after which time they become indistinct,indicating a possible hydrolysis. Tests with the « Api-zim » test system demonstratethe presence of a number of lytic enzymes in freeze-thawed post-ovulatory ovarian tissue,in support of the morphological observations.
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