Читать книгу Woman - William J. Robinson - Страница 16

Like the testicles in man, so the ovaries in woman are the essential sexual organs. They are the fundamental organs, without which the other sexual organs are useless. Also like the testicles in man, the ovaries have two distinct functions, manufacturing two distinct substances. One function is to manufacture eggs; this, called the oögenetic or egg-producing function, is its racial function; without it the race could not perpetuate itself. But the ovary has also an individual function. Besides the ova, the ovary manufactures what we call an internal secretion which is absorbed by the blood, and which is of the greatest importance to the woman herself. While the manufacture of ova begins only at puberty, with menstruation, and closes at the menopause, the manufacture of the internal secretion lasts throughout the woman's entire life. This secretion, which consists of various chemical substances, has a tremendous influence not only on the development of the woman's body, but also on her feelings.

First of all it is necessary for the development of the woman's special characteristics, or secondary sexual characters. Without that internal secretion of the ovaries, a woman would look more or less like a man; she would not develop her beautiful rounded form, her pretty long hair, her breasts, her broad pelvis, her feminine voice, etc. Second, the secretion is necessary to the proper development of her other sexual organs; if the ovaries are cut out, then the uterus and the vagina and even the vulva shrivel up. Third, it is that internal secretion that excites in woman sexual desire and makes her enjoy relations with the male sex. If the ovaries are cut away, particularly if it is done early in life, the woman has no sexual desire and no enjoyment. Fourth, it contributes to the general health, wellbeing, energy, and mental alertness of the woman.

You see the importance of the internal ovarian secretion, and you will readily understand why, when the ovaries are removed by operation, the woman, particularly if she is young, undergoes such marked changes. It is because we recognize now the great importance of the ovaries that we always, when operating on diseased ovaries leave at least a small piece of ovary, if at all possible.

Number of Ova. When the female infant is born, her ovaries contain as many ova or eggs as they ever will contain. In fact, they contain more than they will at puberty. For it is estimated that at birth each ovary contains about 100,000 ova; the majority of these, however, disappear so that at the age of puberty each ovary contains only about 30,000 ova. As only one ovum ripens each month from the time of puberty to the time of the menopause (i.e., about 300 to 400 ova at the utmost during a lifetime), and as only a dozen or two ova would be necessary for the propagation of the race, it seems a superabundance of ova, an unnecessary lavishness. But nature is lavish where the propagation of the species is concerned. A portion of an ovary or of both ovaries might become diseased, and thousands of ova might become unfit for fertilization; nature therefore puts in an extra reserve supply. We see a still more striking example of this extreme extravagant lavishness in man; only one spermatozoön is necessary to impregnate the ovum, and only one spermatozoön can penetrate the ovum; nevertheless each normal ejaculation of semen contains between a quarter and half a million spermatozoa.

The Graafian Follicles. Each primitive or primordial ovum[3] is imbedded in a little vesicle or follicle, which is generally known as Graafian follicle, and there are as many Graafian follicles as there are ova. (The Graafian follicles were first described about 250 years ago—in 1672—by a Delft physician named De Graaf, hence the name.) Until puberty, that is the commencement of menstruation, the Graafian follicles with the oöcytes or primitive ova are in a more or less dormant condition. But with the onset of puberty there commences a period of intense activity in the ovaries. This period of activity is repeated regularly once a month, and it constitutes the process of ovulation and menstruation. The two processes are closely though not causally connected. Ovulation consists in the monthly maturation and extrusion of a ripe ovum; menstruation, which will be further discussed in a separate chapter, consists in the monthly discharge of blood, mixed with mucus from the inside lining of the uterus. Every twenty-eight days, from the time of puberty to the time of the menopause, a Graafian follicle bursts and an ovum is extruded from the ovary. Before the follicle bursts, it swells and enlarges and reaches the surface of the ovary; the whole follicle is congested with blood, but at one point near the surface of the ovary it is pale and thin, and here the rupture takes place.

Section of Ovary.

1. Graafian follicle in the earliest stage.

2, 3, 4. Follicles in more advanced stages.

5, 7. Almost mature follicle.

6. Follicle from which the ovum has escaped.

8. Corpus luteum.

Corpora Lutea. After the Graafian follicle has burst and the ovum has been pushed out, the cavity that is left does not remain empty and functionless; there is a further process going on there; there is a growth of cells, of a yellowish color, and the follicle becomes filled with a yellowish body, which on account of its color is called the corpus luteum (plural—corpora lutea; luteum in Latin—yellow, corpus—body). This corpus luteum grows in size until it sometimes occupies as much as one-third of the ovary. But there is considerable difference between the corpora lutea of non-pregnant and pregnant women. Up to the end of about a month the corpora lutea are the same, but after that the corpus luteum of the non-pregnant woman begins to get smaller, to shrink, so that at the end of two or three months it is reduced to a small scar and later cannot be noticed at all. The corpus luteum of the pregnant woman keeps on increasing until the end of the second month, remains about the same size until the end of the sixth month, and only then begins gradually to diminish. The corpus luteum of the non-pregnant woman, that is, the one following menstruation, is called false corpus luteum; the corpus luteum following pregnancy is called a true corpus luteum. The corpus luteum acts like a gland and elaborates a secretion which has an influence on the circulation in the uterus and on menstruation. It probably possesses other properties, with which we are not yet quite familiar. The corpora lutea of various animals are now prepared in powder or tablet form and used in medicine in the treatment of certain diseases of women.