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The ovary is covered with germinal epithelium. It has many follicles in varying stages of development. The mature follicle is called  the Graafian follicle. It  releases the contained egg at ovulation. After this release, the remaining follicle forms the corpus luteum.

Differential diagnosis: Graafian follicle and surrounding peripheral primary follicles are diagnostic of the fiovary.

Ultrastructure
Histology
Embryology
Gross anatomy