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(anatomy) A spherical cellular aggregation found in the ovaries, each of them containing a single oocyte, or an immature ovum.

Histology section of a mature ovarian follicle. The oocyte is the large, round, pink-staining cell at top center of the image.

(anatomy) A spherical cellular aggregation found in the ovaries, each of them containing a single oocyte, or an immature ovum.

Section of vesicular ovarian follicle of cat. X 50.

(anatomy) A spherical cellular aggregation found in the ovaries, each of them containing a single oocyte, or an immature ovum.

Primordial ovarian follicle. The oocyte is surrounded by a single layer of flat granulosa cells.