What is the normal anteroposterior diameter of the cervix?

The cervix, also known as the uterus, is a very important internal organ for women. The uterus is the place where life is conceived. If there is a problem with a woman's uterus, she will not be able to give birth normally or give birth to a healthy child. Not only that, if there is a problem with the uterus, there will also be problems with the ovaries. The importance of the uterus is beyond words. Below, let's take a look at how much the cervix should be before and after, as well as some knowledge about the cervix.

The normal cervix has a longitudinal diameter of 5.5-7.5 cm, an anteroposterior diameter of 3.0-4.0 cm, a transverse diameter of 4.5-5.5 cm, and a cervical length of 2.5-3.0 cm.

The cervix protrudes into the vagina and contains glands that secrete a kind of mucus, namely cervical mucus. The properties and amount of this mucus, like the endometrium, are affected by ovarian function and show obvious cyclical changes. During ovulation, under the action of estrogen, the cervical mucus becomes thinner, which is conducive to the passage of sperm. At the same time, sperm can also absorb nutrients from the cervical mucus, increase its vitality, and promote the combination of sperm and egg. After ovulation, under the action of progesterone, the cervical mucus decreases and becomes thicker, and a mucus plug may form in the cervical canal, separating the cervix from the outside world and producing a protective effect. At the same time, it is not conducive to the passage of sperm through the cervix.

The uterus is the main internal reproductive organ and is where the embryo is conceived and the fetus grows. The cervix is ​​the opening of the uterus and is a component of the uterus. It plays the following important roles in the process of reproduction and childbirth:

(1) The cervix is ​​the first barrier for sperm to pass through. It secretes mucus. As the menstrual cycle changes, under the action of estrogen, the cervical mucus becomes very thin, which is conducive to the passage of sperm.

(2) The cervical canal is where sperm is stored. Its inner wall has many recesses and fissures, where sperm can be temporarily stored for 1 to 2 weeks, waiting to gain energy before entering the uterus.

(3) After pregnancy, the uterus continues to grow to accommodate the growth of the fetus. But the cervix remains closed, ensuring that the fetus grows safely inside it until the pregnancy is full term.

(4) At full term, during the delivery period, the cervix gradually softens and begins to dilate, and the cervical opening widens from 0.5 cm to 10 cm, opening the first door for the smooth delivery of the fetus. Therefore, the cervix is ​​the only way for the fetus to be delivered.

(5) Some people believe that the cervix is ​​also a sexually sensitive organ and has a certain relationship with sexual life.

For women with a history of miscarriage, the uterus is relatively fragile. If the abortion is not complete and the woman has undergone uterine cleaning, the inner wall of the cervix is ​​very thin. The egg and sperm cannot attach to the wall easily, so pregnancy is not easy. Even if you get pregnant, it is easy to cause miscarriage. Only when the uterus is repaired can you have a baby. However, if the uterus is severely damaged, it may not be able to recover.