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The uterus is a hollow, pear-shaped organ in a woman's lower abdomen in which a fetus grows during pregnancy. When a woman is not pregnant, her monthly menstrual period flows from the uterus.
The lower part of the uterus (cervix) opens into the vagina. The opening to the cervix is narrow except during labor and birth, when it stretches and widens to allow the baby's passage out of the uterus.
Current as of: February 25, 2016
Author: Healthwise Staff
Medical Review: Kathleen Romito, MD - Family Medicine & Martin J. Gabica, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology
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