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Updated February 17, 2010


The uterus is a crucial part of a woman's reproductive system.

Photo © A.D.A.M.
Definition: The endometrium is the lining of the uterus. It is composed of tissue that is rich in blood vessels and specialized glands. Under the influence of estrogen and progesterone, it becomes thicker until it is shed during the menstrual cycle each month.
Also Known As: uterine lining
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