develops from develops from steroid hormone secreting cell granulosa cell A supporting cell for the developing female gamete in the ovary of mammals. They develop from the coelomic epithelial cells of the gonadal ridge. Granulosa cells form a single layer around the mammalian oocyte in the primordial ovarian follicle and advance to form a multilayered cumulus oophorus surrounding the ovum in the Graafian follicle. The major functions of granulosa cells include the production of steroids and LH receptors. FMA:18718 granulosa cell of ovary CALOHA:TS-0729 BTO:0000542 follicular cell of ovary pre-granulosa cell