The role of the cervix is as follows: 1. The cervix is located at the lower end of the uterine body and is connected to the outside world. The epithelium of the outer cervical opening is compound squamous epithelium, which is the first barrier against bacterial invasion. There are a large number of bacteria in the vaginal opening and the vagina, and the cervix is fragile and vulnerable to pathogenic bacteria, and it also plays a role as a barrier. 2. The cervical canal is lined with a single layer of columnar epithelium, and this layer of columnar epithelium contains glands. The cervical canal can secrete a lot of mucus, which usually forms a mucus plug to block the cervical opening, so the mucus plug in the cervical canal forms another important barrier for women to prevent gynecological diseases. 3. The cervix is also the first barrier for sperm to enter a woman’s body, and if it is during ovulation, the cervical mucus will become thinner, which is good for sperm to pass. 4. The cervix will gradually become softer after pregnancy, and during childbirth The cervix may also gradually dilate. The cervical tissue is more elastic and prepares for the delivery of the fetus through the dilatation of the uterine opening.