The cervix is the lower part of the uterus that opens into the
vagina. It is also called the neck of the uterus.
The endometrium is the mucous membrane that lines the inside of the
uterus (womb). The endometrium changes throughout the menstrual cycle. It
becomes thick and rich with blood vessels to prepare for pregnancy. If the
woman does not get pregnant, part of the endometrium is shed, causing menstrual
ByHealthwise Staff Primary Medical ReviewerSarah Marshall, MD - Family Medicine Specialist Medical ReviewerKirtly Jones, MD - Obstetrics and Gynecology
Sarah Marshall, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology
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