Foetal ovary

Foetal ovary

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Caption: Foetal ovary. Light micrograph of a section through a foetal ovary. The ovary contains primordial follices (cysts), which form between the fourth and seventh month of foetal development. Within each follice is a primary oocyte, or ovum (purple dot). Once sexual maturity is reached, up to 20 primordial follicles are activated to form a mature follice in every menstrual cycle. Only one will reach full maturity and be able to release its ovum (egg) at ovulation. Over a woman's lifetime, 99.9% of her eggs will be destroyed without having been released by a process called atresia. Mag: x430 when 10cm wide.

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Keywords: anatomical, anatomy, atresia, biological, biology, coloured, cyst, egg, fetal, fetus, foetal, foetus, follices, histology, immature, light micrograph, light microscope, oocyte, oocytes, ova, ovarian, ovary, ovum, physiological, physiology, primary, primordial follicle, reproduction, reproductive system, section, sectioned, sexual, stained, structure, toluidine blue stain

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