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Ovarian follicles

Ovarian follicles

P616/0313

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Credit

INNERSPACE IMAGING / SCIENCE PHOTO LIBRARY INNERSPACE IMAGING / SCIENCE PHOTO LIBRARY

Caption

Ovarian follicles. Light micrograph of a sectioned ovary, showing the egg-containing follicles (pink circles). In the foetal ovary, primary oocytes (eggs, small pink circles) begin division and are surrounded by a layer of granulosa cells (purple dots), forming primordial follicles (upper frame). No further development occurs until sexual maturity is reached. During each menstrual cycle around 15 primordial follicles are activated but usually only one matures fully, becoming a primary follicle (larger body, lower left) surrounded by several layers of follicular cells, and then a Graafian follicle, releasing the oocyte at ovulation. Magnification: x30 at 35mm size.

Release details

Model release not required. Property release not required.

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