THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The muscular canal that goes from the uterus to the outside of the body. During birth, the baby passes through the birth canal. Also called vagina. Anatomy of the female reproductive system.

Detailed explanation-2: -The first stage of labor and birth occurs when you begin to feel persistent contractions. These contractions become stronger, more regular and more frequent over time. They cause the cervix to open (dilate) and soften as well as shorten and thin (efface) to allow your baby to move into the birth canal.