The cortex of the ovary contains numerous follicles embedded in a thick stroma. Most of the follicles are resting primordial follicles.
Follicles which have been stimulated to develop progress through primary and secondary stages to become mature tertiary or Graafian follicles, in which a large fluid-filled cavity, the antrum, is surrounded by many layers of granulosa cells. Stromal cells around the follicle form the theca interna, which secretes estrogen, and the theca interna. The cumulus oophorus, containing the oocyte, seldom appears in random sections such as this.
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Last updated: 21 March 2002 / dgk