This is the development of the primary ovarian follicle from its primordial stage when it is called the primary follicle. It then reaches maturity at the Graafian follicle which ruptures in ovulation to allow the egg to escape. The developent of the egg in the follicle goes on parri passu with the development of the surrounding tissue called follicle. First the surrounding tissue breaks down to form a cavity called follicular cavity which then acquires fluid called liquor folliculi. The external membranes of the follicle are the theca interna and theca externa. The innermost membrane is the membrana granulosa containing granulosa cells. The cells which surround the developing egg and may be released with it some anchoring to it, is the cumulus oophorus. The steroid hormone estrogen assists the development of the follicle and it is in turn influenced by negative feedback of the FSH gonadotropin from the anterior pituitary gland.  




















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