Section through ovary showing egg follicles

Section through ovary showing egg follicles

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Credit: DR DON FAWCETT/SCIENCE PHOTO LIBRARY.

Caption: Light micrograph of a number of primary follicles (potential female ova - eggs) in the ovarian cortex. The development of primordial follicles (formed between the 4th & 7th months of foetal development) into primary follicles begins at sexual maturity. In each ovarian cycle up to 20 primordial follicles are activated to form a primary follice: only one will reach full maturity & be released at ovulation. Follicular cells proliferate to form a thickened layer, the zona granulosa. The central oocyte (housing the female gamete) is separated from the follicular cells by a glycoprotein layer, the zona pellucida.

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Keywords: anatomy, egg, female reproductive system, human body, light micrograph, lm, ovarian cortex, ovary, ovum, primary follicle, reproduction

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