THE SPERM TRACT AND THE PRODUCTION OF SEMEN

From its site of production in the testes, the sperm must travel through the sperm tract to reach the outside of the body. As it does so, the various components that make up the seminal fluid are added to the sperm. The sperm tract, illustrated in figure 3.7, consists of a number of ducts including the epididymis, the vas deferens, the ejaculatory duct, and the urethra. In addition, a number of glands that secrete various fluids join the sperm tract through a series of small ducts.

After being produced in the seminiferous tubules, the sperm are stored in the epididymis, which is a highly coiled, interconnected network of seminiferous tubules lying in the upper part of the testes. As the sperm mature in the epididymis, they become capable of movement as the neck of each sperm becomes flexible.

The vas deferens carries the sperm from the epididymis to the ejacu-latory duct. At this point, the ducts of the seminal vesicles join the sperm tract and provide a viscous, alkaline secretion containing fructose and prostaglandins. The fructose, a sugar, is a source of energy for the sperm; the prostaglandins stimulate uterine contractions and help the sperm move to the female's fallopian tubes where fertilization takes place. The prostate gland surrounds the ejaculatory duct at the place where it becomes the urethra. It secretes a milky fluid that aids in sperm motility. The fluid contains, among other things, a large concentration of bicarbonate ions that gives the semen its alkaline pH. The alkaline nature of the seminal vesicle fluid and the prostate gland fluid reduces the acidity present in the urinary system, which is joined to the sperm tract at the urethra. This is particularly important since sperm motility is adversely affected by an acidic environment. Finally, the bulbourethral glands (Cowper's glands) secrete a mucuslike substance that provides lubrication for the urethra.

The secretions just described are called seminal fluid, and the combination of sperm and seminal fluid is called semen. Since there frequently is confusion as to the distinction between sperm and semen, it is worthwhile to point out that while sperm are under the careful hormonal control previously described, the seminal fluid is produced by the body as needed and is not affected by hormonal levels. Also important is the fact that the semen contains an antibiotic substance called seminalplasmin. Were it not for seminalplasmin, seminal bacteria would almost always infect women's vaginas, making sexual intercourse a routine health hazard.

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HOW CAN PMS BE RELIEVED: WILL HAVING A BABY HELP?
A When I was a teenager I would get really unreasonable with my boyfriend and my mother at least one week out of every month. Sometimes in the middle of a nasty tirade, however, I'd stop because I'd get weak and dizzy. My mother thought there was something really wrong with me and took me to doctor after doctor. All the doctors said the same thing: "After you have children your hormones will change and you'll be fine." So I endured my adolescence, which I think was harder on the people around me than it was on me, and I married and gave birth to three terrific children in four years. Now my problem is starting all over again. I don't seem to have changed at all, except now I have a husband and three children to cope with as well. After all those promises, what went wrong? Why did the doctors lie to me?

—A.G.

Wheeling, West Virginia

Giving birth to a baby will not correct a woman's hormonal imbalance or make her premenstrual syndrome disappear. A doctor who tells a woman she can expect relief after pregnancy is either deluded or lying. Queen Victoria, as mentioned earlier, was serene during pregnancy, but only during pregnancy. A pregnant or breastfeeding woman lives with a steady hormonal balance in her body which makes her feel good, but after she gives birth or stops breastfeeding, the ebb and flow of her hormones return as if they had never left. If a woman had an imbalance before pregnancy, she will have an imbalance after pregnancy. She will always be battling her premenstrual syndrome and her best hope for relief will come from the remedies already discussed. On the other hand, she may be one of those women whose estrogen production changes as she gets older, in which case age may release her from her symptoms.

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