Normal cervicovaginal epithelium is

The normal cervix is ​​smooth and composed of three types of epithelial cells, including squamous epithelial cells, columnar epithelial cells and metaplastic squamous epithelial cells. Most of the cervix is ​​covered by squamous epithelial cells, which are flat, light pink and opaque epithelial cells, similar in appearance to the oral endometrium; while columnar epithelial cells are only confined to the endocervical canal, tightly surrounding the outer opening of the endocervical canal, with a redder color and a similar appearance to the conjunctivitis of the eyes. The columnar epithelial cells converge with the squamous epithelial cells of the cervix.

Cervical function

The cervix protrudes from the female vagina and contains glandular ducts that secrete a kind of mucus, namely cervical mucus. The characteristics and quantity of this mucus, like the uterine wall, are affected by the ovaries and show significant regular changes. During ovulation, under the action of estrogen, cervical mucus is thinner, which is beneficial to the passage of sperm. In addition, sperm can also absorb nutrients from cervical mucus, which enhances its charm and promotes the fusion of sperm and egg cells. During ovulation, under the action of estrogen, cervical mucus decreases and becomes thicker, and a mucus plug may be formed in the cervical canal, which separates the cervix from the outside and creates a protective effect. At the same time, it is not conducive for sperm to pass through the cervix.

⑴The cervix is ​​the first barrier for male sperm to pass through. It metabolizes mucus. With the change of the menstrual cycle, under the action of progesterone, the cervical mucus becomes thinner, which is conducive to the passage of sperm.

⑵The cervical canal is the area where male sperm is stored. Its inner cavity has many recesses and cracks, and sperm can be temporarily stored for 1 to 2 weeks, waiting to gain energy before entering the uterus.

⑶After pregnancy, the uterus continues to expand to accommodate the growth and development of the fetus. However, the cervix remains closed, ensuring the safe growth and development of the fetus in the uterus until full term.

⑷ At full term, the cervix gradually loosens during delivery and begins to expand. The cervical opening enlarges from 0.5 cm to 10 cm, opening the first door for the successful delivery of the fetus. Therefore, the cervix is ​​the only way for the delivery of the fetus.

⑸ Many people think that the cervix is ​​a sexually sensitive organ of the human body and is related to the sexual life of couples.