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Folliculogenesis is the process in which a recruited primordial follicle grows and develops into a specialized graafian follicle with the potential to either ovulate its egg into the oviduct at mid-cycle to be fertilized or to die by atresia.
Each oveary contains thousands of tiny, saclike structures called graafian follicles, each containing an ovum. When an ovum ripens, the mature follicle moves to the surface of the ovary, ruptures, and releases the ovum; a process called ovulation. After ovulation, the empty follicle is transformed into a structure called the corpus luteum, a small yellow mass that secrets eestrogen and progesterone.