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Mature (Graafian) Follicle. The green arrow points to the thin wall of granulosa cells. The red arrow points to the cytoplasm of the primary oocyte. Several granulosa cells are clustered between the wall of the follicle and the primary oocyte to form a "pedestal" or Cumulus Oophorus (black arrow). The cells forming the cumulus oophorus will eventually dissociate, freeing the oocyte and its surrounding cell population into the antrum in preparation for ovulation.