Ovarian follicles, light micrograph

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Ovarian follicles, light micrograph

Ovarian follicles. Light micrograph of a primary (lower left) and secondary (upper right) ovarian follicles containing oocytes (ova) at their centres. At birth there are tens of thousands of primordial follicles, the precursors to primary follicles, present in the ovaries. Once sexual maturity is reached, primordial follicles are triggered to start developing into primary follicles every menstrual cycle. In the secondary follicle stage the chromosome-containing oocyte enlarges and is surrounded by follicular cells (dark brown dots). One secondary follicle per month becomes a Graafian follicle, releasing its egg at ovulation

Science Photo Library features Science and Medical images including photos and illustrations

Media ID 6453679

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Cortex Developing Development Eggs Follicle Follicles Follicular Gamete Gametes Growing Growth Mammal Mammalian Maturation Maturing Menstrual Cycle Oocyte Oocytes Ovaries Ovary Ovule Ovules Ovum Primary Rabbit Re Production Reproductive System Secondary Sex Cells Light Micrograph Light Microscope Section Sectioned

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