Coloured SEM of cross section of primary oocyte

Coloured SEM of cross section of primary oocyte

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Credit: BAGAVANDOSS/SCIENCE PHOTO LIBRARY

Caption: Human egg cell. Coloured Scanning Electron Micro- graph (SEM) of a slice through a primary oocyte (egg cell) inside a maturing follicle from the ov- ary of a mature female. The oocyte (green) con- tains a central nucleus (yellow) and is surrounded by the granulosa cells (red) of the follicle. Be- tween the granulosa cells and the oocyte is the zona pellucida (blue), a thick layer of glycopro- tein, through which finger-like processes can be seen connecting the granulosa cells to the mem- brane of the oocyte. This picture shows one stage in the maturation of an egg cell during the ovar- ian cycle, before the cell's release from the ovary (ovulation). Magnification x75 at 35mm size.

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Keywords: anatomy, egg, egg cell, female reproductive system, follicle, granulosa cell, human body, oocyte, ovarian, ovarian tissue, ovum, primary, primary oocyte, reproduction, zona pellucida

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