Fig. 15. Life history of the ovarian follicle. Starting with the primordial follicle, we have next the maturing follicle. Approximately 1 of 300 follicles fully (as shown on lower line), ruptures, and a corpus luteum. The other 299 become atretic. The final stage of both the artetic follicle and the corpus luteum is the corpus atreticum, with eventual reabsorption of this scar into the stroma of the ovary. (Frank.)