Cervical epithelial tissue has the ability to repair the cervix and prevent pathogens from invading the uterine cavity from the cervical opening. Cervical epithelial tissue is the skin tissue on the surface of the cervical tissue, which is composed of complex squamous epithelial cells, and a single layer of columnar epithelial cells. Cervical glands can secrete glandular fluid, forming mucus plugs in the cervical canal, blocking the outer mouth of the cervix, preventing pathogens from invading the uterine cavity upward through the cervix. When the cervix is infected by inflammation, the squamous epithelial cells can extend to the lower third or higher part of the cervical canal to prevent further inflammatory damage; while underneath the columnar epithelial cells, the chemotaxis cells proliferate and further differentiate to the squamous epithelium, thus repairing the cervix.