Multiple Pregnancies

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Formation

Women are born with several hundred thousand primary oocytes (from the Greek "oon" meaning "egg" and "kytos" meaning "cell") in the ovaries. Primary oocytes are the cells that eventually develop into mature eggs which, if fertilized, become embryos. Most of them degenerate during childhood and only several hundred mature during the course of a woman's reproductive lifetime.

The eggs are released by the ovaries and are available for fertilization about once a month (except durin...Read the full article