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https://www.invitra.com/en/wp-content/uploads/2022/01/folliculogenesis-types-of-follicles.png24001020Folliculogenesis refers to the process of ovarian follicle development. Follicles are the structures that contain the oocytes in the ovaries, which are given different names that determine the stages of folliculogenesis: primordial, primary, secondary, preantral, antral and Graaf's follicle.