Explaining Human Pains on Instagram: "The cervix is one of the most fascinating and important structures in the female reproductive system. What you’re seeing here is the lower end of the uterus, viewed from inside the vaginal canal. A healthy cervix typically appears smooth, pink, and slightly moist because it’s lined with protective mucous membranes. The small central opening, called the cervical os, changes shape throughout a woman’s life—opening slightly during ovulation, pregnancy, or child