Post Date November, 16 2024
Ejaculation is a reflex process. First, the contraction of testicular output tubules, then the contraction of testicular head and body, and then the contraction of testicular tail. Sperm expels the ampulla of the vas deferens through the vas deferens, and finally expels the prostate seminal vesicle gland, expelling sperm and seminal plasma from the urethra. With the contraction of bulbocavernosus muscle and ischiocavernosus muscle, the bladder neck is also closed to prevent the semen from retrograde injection into the bladder, so that the semen can be ejected rhythmically from the urethra.
It is generally believed that there are seven powerful and rhythmic contractions in the process of ejaculation. We can artificially divide the ejaculation process into two parts, the first three parts are one part, this part of semen is mainly from the prostate, and the rest parts are one part, mainly from the seminal vesicle. Generally speaking, the sperm in the first part is much higher than that in the second part in terms of density, activity rate, activity, survival rate and membrane stability. According to statistics, 89% of men's sperm count in the first part is higher than that in the second part, 5% of the two parts are the same, and 6% of the second part is higher than that in the first part.
Segmental ejaculation has great clinical significance in the treatment of male infertility. When the sperm count and activity rate of the patient are low, or the semen is too thick and the semen volume is too large, women can use the segmented ejaculation method during sexual intercourse during ovulation. After the first stage of semen injection, immediately pull the penis out of the vagina and inject the rest of the semen outside to avoid diluting the semen by the secretion of the seminal vesicle gland, so as to ensure that the high-density, high-quality and high-energy sperm remain in the vagina and improve the pregnancy ability. In the practice of artificial insemination and test-tube babies, staged ejaculation has also become a routine step. After the first segment of semen is processed, highly active sperm is screened and sent to the uterus or used for test-tube infants.
During clinical biochemical examination, 4~6 parts can also be collected according to the sequence of sperm injection. The first part mainly comes from prostate fluid, and the last part with the highest activity of acid phosphatase is seminal vesicular fluid, which contains the highest prostaglandin and fructose. By measuring these special enzymes and substances, we can know the function of the accessory gland. This detection method can also be used to study physiological activities during ejaculation. Some people have nervous problems and the ejaculation process is disordered. Sperm is not mainly ejaculated with prostate fluid, but with seminal vesicle gland fluid. Sperm activity is lower than normal. This may also be one of the reasons for infertility.
