Patient Education - Health Library Cervix
The cervix is the lower third portion of the uterus which forms the neck of the uterus and opens into the vagina which is also called the endocervical canal. The narrow opening of the cervix is called the os. The cervical os allows menstrual blood to flow out from the vagina during menstruation. During pregnancy the cervical os closes to help keep the fetus in the uterus until birth. Another important function of the cervix occurs during labor when the cervix dilates, or widens, to allow the passage of the fetus from the uterus to the vagina.
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