ZBAEREN / EURELIOS / SCIENCE PHOTO LIBRARY ZBAEREN / EURELIOS / SCIENCE PHOTO LIBRARY
Ovarian follicle. Light micrograph of an ovarian follicle (round, centre) containing an oocyte (blue), a developing human egg cell. Surrounding the oocyte are cuboidal follicular cells (purple). Surrounding the follicle are blood vessels and connective tissue. This is a secondary ovarian follicle, the stage following a primary ovarian follicle. The secondary stage is followed by the mature stage (Graafian follicle). This entire process is known as ovulation, and is part of the human reproductive process in females.
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