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The cervix is the lower part of the uterus that opens into the vagina.
The endometrium is the mucous membrane that lines the inside of the uterus. The endometrium changes throughout the menstrual cycle. About once a month, it thickens with extra blood vessels. A pregnancy can occur if a fertilized egg attaches to, or implants in, the endometrium. If a pregnancy doesn't occur, part of the endometrium is shed, causing menstrual bleeding.
Current as of: August 2, 2022
Author: Healthwise StaffMedical Review: Sarah Marshall MD - Family MedicineMartin J. Gabica MD - Family MedicineKathleen Romito MD - Family MedicineJoLynn Montgomery PA - Family Medicine
Author: Healthwise Staff
Medical Review:Sarah Marshall MD - Family Medicine & Martin J. Gabica MD - Family Medicine & Kathleen Romito MD - Family Medicine & JoLynn Montgomery PA - Family Medicine
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