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Cervix

the lower part of the uterus in the human female reproductive system

The cervix is the part of the uterus which protrudes into the vaginal canal. Its function is like that of a gate to the uterus, or womb, where the fetus develops during a pregnancy. It also allows menstrual blood to escape the uterus during the normal reproductive cycle of the female, and allows sperm to access the uterus to fertilize an ovum, or egg.