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Ovarian follicle, SEM

Ovarian follicle, SEM

P632/0095

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Credit

STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY

Caption

Ovarian follicle. Coloured scanning electron micrograph (SEM) of a secondary follicle in the ovary. The follicular cavity, which holds the developing egg (not seen), is at centre (orange) and is surrounded by a layer of cuboidal follicular cells. At birth there are tens of thousands of primordial follicles, the precursors to primary follicles, present in the ovaries. Once sexual maturity is reached, up to 20 primordial follicles are triggered to start developing into primary follicles every menstrual cycle. Only one will reach full maturity and release its egg (ovum) at ovulation.

Release details

Model release not required. Property release not required.

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