The Graafian Follicle

The Graffian Follicle, which contains the ripe oocyte, is formed as follows, The ovary when developed, is covered by a single layer of cells termed the germinal epithelium G.E While the female foets is still in the uterus processes of this epithelium bud down in to the substance of its ovary and become converted into primordial follicles.

The great Majority of the follicles do not further develop, but at, and after, puberty certain of them ripen, which consists in the formation of the graafian follicle and maturation.
One of the cells becomes much larger than the others ], to from the oocyte. 
The cells closely embracing the oocyte from a structure termed the discus proligerus D.P. Most of the remaining cells liquefy, L.F,,, Except those on the extreme outside which form the membrana granulosa, M.G Thus the graffian follicle  is formed.