Science glossary film: Cervix

The lower end of the uterus, where it joins and protrudes into the upper end of the vagina. The passage through the cervix is called the cervical canal. It allows menstrual blood to escape, allows the passage of sperm from the vagina into the uterus for fertilization, and during childbirth can expand to up to 10 centimeters in diameter to allow the passage of the baby.

The passage through the cervix is called the cervical canal. It allows menstrual blood to escape, allows the passage of sperm from the vagina into the uterus for fertilization, and during childbirth can expand to up to 10 centimeters in diameter to allow the passage of the baby.