THE FEMALE GENITAL ORGANS: THE REPRODUCTIVE CYCLE OF WOMAN

The reproductive cycle of woman involves a very intricate mechanism which is not yet fully understood. It is known, for example, that the anterior pituitary gland (located beneath the front part of the brain) periodically produces hormones which influence the activity of the ovaries and through them, the uterus. One of these hormones favors ovulation, or the development of ova. Another induces changes in the uterus necessary to pregnancy. All the details concerning how these changes are brought about are not known. The main facts of ovulation, however, may be described as follows:

Every four weeks in either the right or the left ovary a small follicle or pouchcalled the Graafian follicleripens and comes to the surface of the ovary. This follicle is filled with a fluid containing the ovum, which is about one-fifth of a millimeter in diameter (roughly 1/125 of an inch). When the follicle becomes entirely ripe, it bursts, and the ovum passes into the Fallopian tube. From here the contractions of the tube carry the ovum to the uterus. The burst follicle, however, does not cease to function but develops into a gland, called the corpus luteum, which secretes and pours into the blood a substance which has some function in connection with pregnancy. The corpus luteum remains active for almost two weeks and then, if conception has not occurred, it disintegrates and disappears and, as we have seen, the surplus membranes of the uterus likewise fall away. On the other hand, if the ovum is fertilized, the corpus luteum usually continues its activity for at least several months during pregnancy.

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