How does sperm enter the fallopian tube

We have already learned in junior high school biology textbooks that men and women need to form a fertilized egg in order for the woman to get pregnant, and in the process of forming a fertilized egg, the male's sperm needs to enter the female's body. However, because everyone was relatively ignorant at that time, many people did not know whether the sperm entered the fallopian tube or the uterus. So how does the sperm enter the fallopian tube?

The embryonic growth and development process takes about 40 weeks, and then a baby is born. During the 10-20 period of a woman's menstrual cycle, the ovaries produce mature eggs. If a man and a woman have sex at this time, the sperm enters the fallopian tube through the woman's vagina and uterus. In this process, up to 200 million sperm are trying their best to rush to the mature egg. When they meet the egg in the fallopian tube, the strongest sperm will eventually combine with the egg to form a fertilized egg within 24 hours. After three or four days, the fertilized egg enters the uterus and implants, and a nearly 40-week gestation period begins, during which a baby is about to be born.

If a couple does not take any contraceptive measures and fails to get pregnant for more than one year, infertility can be diagnosed. Both husband and wife need to go to the hospital for examination together. Fasting blood draw for women to test six endocrine hormones, four immune antibodies, three thyroid function tests, and color Doppler ultrasound of the uterine appendages. It is recommended that women have a hysterosalpingography 3-7 days after menstruation to see if the fallopian tubes are unobstructed.

The sperm that enters the vagina passes through many checkpoints, such as cervical mucus and uterine cavity. At the climax of sexual intercourse, the sperm is sucked into the isthmus through the interstitial part of the fallopian tube through the relaxation of the funnel-shaped uterine angle sphincter and the attraction of muscle peristalsis. The uterus-fallopian tube junction is another barrier for sperm to enter the fallopian tube, which can regulate the number of sperm entering the fallopian tube. Progesterone can also affect the delivery of sperm.