Cervical short channel surrounded by strong muscles open in the vagina and widen at birth to exit the fetus from the uterus under the influence of the open process

Cervical is a short channel surrounded by strong muscles open in the vagina, and can not expand significantly only at birth; For the fetus to exit from the uterus under the influence of the open process. It also has glandular glands secrete mucous fluids, which varies according to the different days of the menstrual cycle.