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.
Kathleen Romito, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology
The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.