The cervical canal is part of the cervix. The cervical opening is from the part connected to the vagina to the cervix, and between the part connected to the uterine body is the cervix, which presents a cone-like performance, hollow in the middle, and the hollow part is the cervical canal, which is covered with glands and mucous membranes and can secrete a small amount of mucus, an important part of the leucorrhoea. The cervix is relatively short in normal adults, but during labor in women of childbearing age, it gradually dilates and lengthens, and can be up to 10 cm long, facilitating the delivery of the fetus. In the case of cesarean delivery, it is also possible to choose to deliver the fetus by cutting in the weaker part of the lower uterine segment, which can reduce the occurrence of side injuries. In contrast, the ectocervix is covered by compound squamous epithelium and the endocervical canal is covered by columnar epithelium, with a migratory zone between the two, which needs to be distinguished from cervicitis.