Histochemical changes in adenosine triphosphatase activity during folliculogenesis and corpus luteum formation and regression in the rat ovary.

Histoenzymological changes in Adenosine triphosphatase (ATPase) activity were studied during folliculogenesis in immature and mature rat ovary. Its presence in oocytes of small follicles and absence in those of large follicles postulate a correlation between their absorptive mechanism during the development of the oocyte. The presence of ATPase activity in the theca, corpora lutea and interstitial gland tissue may be related to the vascular endothelium which is associated with the transport system across the membrane.