Ovarian follicle, SEM

Ovarian follicle, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Ovarian follicle. Coloured scanning electron micrograph (SEM) of a secondary follicle in the ovary. The developing egg is sectioned at centre (brown) and is surrounded by cuboidal follicular cells (light brown). 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 as a seconday follicle and release its egg (ovum) at ovulation.

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Keywords: anatomy, biological, biology, coloured, cuboidal, developing, egg, false-coloured, female, female reproductive system, follicular, fractured, freeze fracture, healthy, human body, images, magnified image, maturing, microscopic subjects, normal, oocyte, ovary, ovum, reproduction, scanning electron micrograph, scanning electron microscope, secondary follicle, section, sectioned, sem

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