The uterus is protected by the cervix. Cervix is a rigid barrier to the vag*na which opens over a period of time during pregnancy. The birth canal is 3 to 7 inches in length, depending on the woman’s state of aro*sal
The above ultrasound image is of an actual inside a woman who is 6 month pregnant. The white colored area is the cervix. Then is the uterus, amniotic sac and the baby. As depicted in the picture the direction of a pen*s fits in a space underneath the cervix and uterus