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Ovarian follicle, light micrograph

Ovarian follicle, light micrograph

C023/9426

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Credit

MICROSCAPE / SCIENCE PHOTO LIBRARY MICROSCAPE / SCIENCE PHOTO LIBRARY

Caption

Light microscopy of a growing ovarian follicle at the early antral stage of development. The central oocyte (female germ cell) is surrounded by follicular cells separated from the oocyte cytoplasm by a thin coat of special proteins called the zona pellucida which serves to bind sperm during fertilization, and to protect the early embryo if formed. Peripheral layers of flattened cells make up the thecal tissues. Fluid-filled gaps between follicular cells signify the initial stages of antrum formation during folliculogenesis which enlarge to dominate the volume of the follicle as it approaches ovulation. Magnification x500 when printed at 10 cm.

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