Follicles in a human ovary, micrograph

Follicles in a human ovary, micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Developing follicles in a human ovary, light micrograph. Three developing Graafian follicles are seen. A Graafian follicle is a structure in the ovaries from which an ovum (egg cell) is released. It comprises an ovum (inner circle), surrounded by the zona granulosa (purple dots). The pale area in each follicle is the fluid- containing antrum. The zona granulosa secretes follicle stimulating hormone (FSH) and produce oestrogen. FSH stimulates the maturation of the follicle. When mature it releases the ovum, which travels from the ovary down the Fallopian tube to the uterus. Normally, only one ovum is released each month, although several follicles may develop.

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Keywords: anatomical, anatomy, biological, biology, cell, cycle, egg, female, fertile, fertility, follicle, follicles, graafian follicle, histological, histology, human body, light micrograph, light microscope, ovarian, ovary, ovulation, ovum, reproduction, reproductive system, three, trio, zona granulosa

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