FECUNDATION OR FERTILIZATION

 

Fecundation or Fertilization—Process of Fecundation—When the Ovum Matures—Fate of Ovum When no Intercourse Has Taken Place—Entrance of Spermatozoa as Result of Intercourse—The Spermatozoa in Search of the Ovum—Rapidity of Movements of Spermatozoa—Absorption of Spermatozoön by Ovum—Activity of Impregnated Ovum in Finding Place to Develop—Pregnancy in the Fallopian Tube and Its Dangers—Twin Pregnancy—Passivity of Ovum and Activity of Spermatozoön Foretell the Contrasting Rôles of the Man and the Woman Throughout Life.

Fecundation and fertilization are important terms to remember. They stand for the most important phenomenon in the living world. Without it there would be no plants and no animals, excepting a few very low forms of no importance, and of course no human beings.

Fecundation or fertilization is the process of union of the female germ cell with the male germ cell; speaking of animals, it is the process of union of the egg or ovum of the female with the spermatozoön of the male. When a successful union of these two cells takes place a new being is started. The process of fertilization or fecundation is also known as impregnation and conception. We say, to fertilize (chiefly, however, when speaking of plants) or to fecundate an ovum, or to impregnate a female or woman, and to conceive a child. We say the woman has become impregnated or has conceived.


The Process. The process of fecundation is briefly as follows. An ovum becomes mature, breaks through its Graafian follicle in the ovary and is set free. It is caught by the fimbriated or trumpet-shaped extremity of the Fallopian tube and, moved by the wave-like motion of the cilia of the lining of the tube, it begins its travel towards the uterus. If no sexual intercourse has taken place nothing happens. The ovum dries up, or "dies," and either remains somewhere in the tube or womb or is removed from the latter with the menstruation, or mucous discharge. But if intercourse has taken place, thousands and thousands of the male germ cells or spermatozoa enter the uterus through its opening or external os, and begin to travel upward in search of the ovum. The spermatozoa are capable of independent motion, and they travel pretty fast. It is claimed that they can travel an inch in seven minutes, which is pretty fast when you take into consideration that a spermatozoön is only 1/300 of an inch long. Many of the spermatozoa, weaker than the others, perish on the way, and only a few continue the journey up through the uterus to the tube.

 When near the little ovum, which remains passive, their movements become more and more rapid, they seem to be attracted to it as if by a magnet, and finally one spermatozoön—just one—the one that happens to be the strongest or the nearest, makes a mad rush at it with its head, perforates it, and is completely swallowed up by it. As soon as the spermatozoön has been absorbed by the ovum, the opening through which it got in becomes tightly sealed up—a coagulation takes place near it—so that no other spermatozoa can enter the ovum. For if two or more spermatozoa got into the same ovum a monstrosity would be apt to be the result.

Spermatozoön Penetrating the Ovum.

What becomes of all the other spermatozoa? They perish. Only one is needed. But in the ovum that has been impregnated, and which is now called an embryo, a feverish activity commences. First of all it looks for a fixed place of abode. If the ovum happened to be in the uterus when the spermatozoön met and entered it, it remains there. It becomes attached to some spot in the lining of the womb and there it grows and develops, until at the end of nine months it has reached its full growth, and the womb opens and it comes out into the outside world. If the ovum is in the Fallopian tube when the spermatozoön meets it, as is usually the case, it travels down to the uterus, and fixes itself there.