The ovaries of a newborn baby girl contain about 250,000 egg cells. By the time she reaches maturity, there will be about 10,000 remaining, However, only a few of these eggs will be used - one each month throughout the years when she can have a baby. Every 28 days, a swelling appears on an ovary. This releases the egg cell then enters the fallopian tube. The swelling it emerged from produces hormones to prepare the womb to receive the egg.
Each month, an egg cell is released from the ovary. When this happens, the lining of the womb changes so that it is ready to receive the egg if it is fertilized.
If the egg is not fertilized, the womb lining brakes down, and blood and tissue pass out through the vagina. this process is called menstruation and it happens about every 28 days. The time from one period to the next is known as the menstrual cycle.
Hormones from the pituitary gland and the ovaries control the menstrual cycle, which maybe irregular. However, it usually settles into a regular cycle.
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