Female Anatomy

The Cervix

The cervix is the lower part of the uterus. It is round and shaped like a tube. It has a small hole in the middle of it. During pregnancy, a protective mucus plug forms inside this hole. Usually, the cervix is almost completely closed until labor, when it dilates (opens). This provides room for the baby to move from the uterus into the birth canal and then out into the world.
Last reviewed by: Arthur Schoenstadt, MD
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