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 fertilized egg doesn't implant, part of the endometrium is shed, causing menstrual bleeding.
Current as of: November 27, 2023
Author: Ignite Healthwise, LLC Staff
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