What Happens To The Primary Oocyte When The Ovarian Follicles Mature?

When ovarian follicles mature, the primary oocytes divide into secondary oocytes and a small rudimentary ovum referred to as the first polar body. This takes place around the time when follicles develop their cavity. The oocyte also acquires a translucent acellular envelope – zona pellucida. The secondary oocyte is released at ovulation which has a diameter of 120-140 micrometres and wrapped by the zona pellucida and some layer of cells called corona radiata. At the time of fertilization, a second polar body is formed.

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