Figure 227

Secondary follicle in a late stage of development, a. Schematic drawing of a mature (Graafian) follicle with a large antrum containing an oocyte embedded within the cumulus oophorus. The cells of the cumulus oophorus immediately surrounding the oocyte remain with it after ovulation and are referred to as the corona radiata. b. Photomicrograph of a mature secondary follicle. Note the large fluid-

,granulosa cells cells that will become corona radiata after ovulation

cumulus oophorus

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