Ovarian follicle, TEM

Ovarian follicle, TEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Ovarian follicle. Coloured transmission electron micrograph (TEM) of a primary follicle in an ovary. The developing egg (oocyte, pink) has a large nucleus (green) and is surrounded by cuboidal follicular cells (green and 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 and release its egg (ovum) at ovulation. Magnification: x1000 when printed 10 centimetres wide.

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Keywords: biological, biology, cells, collagen, coloured, cuboidal follicular cell, developing, egg, false-colour, false-coloured, female reproductive system, human body, maturing, nucleus, one, oocyte, ovary, primary follicle, reproduction, single, stroma, tem, transmission electron micrograph, transmission electron microscope

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