The uterus is made up of the fallopian tubes, the body of the uterus (womb) and
the cervix. It's only about three inches long, but when pregnant the uterus can
expand to hundreds of times its normal volume. There are three layers in the
uterus. The inner and most active layer is called the endometrium. The middle
layer is called the myometrium, the muscular layer is responsible for menstrual
cramps and contractions during labor. The outside layer is called the
epimetrium, which is a thin layer of protective tissue.
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