A treatise on the science and practice of midwifery . the ovaryor just within the fimbriated extremity of the tube. Mode in ivhich the Ascent of the Semen is Effected.—The semen is proba-bly carried upward chiefly by the inherent mobility of the is believed by some that this is assisted by other agencies : amongstthem are mentioned the peristaltic action of the uterus and Fallopiantubes; a sort of capillary attraction effected when the Avails of theuterus are in close contact, similar to the move-ment of fluid in minute tubes; and also thevibratile action of the cilia of the epi
A treatise on the science and practice of midwifery . the ovaryor just within the fimbriated extremity of the tube. Mode in ivhich the Ascent of the Semen is Effected.—The semen is proba-bly carried upward chiefly by the inherent mobility of the is believed by some that this is assisted by other agencies : amongstthem are mentioned the peristaltic action of the uterus and Fallopiantubes; a sort of capillary attraction effected when the Avails of theuterus are in close contact, similar to the move-ment of fluid in minute tubes; and also thevibratile action of the cilia of the epitheliumof the uterine mucous membrane. The actionof the latter is extremely doubtful, for theyare also supposed to effect the descent of theovule, and they can hardly act in two oppo-site ways. The movement of the cilia beingfrom within outward, it would certainlyoppose rather than favor the progress of thespermatozoa. It must, therefore, be admittedthat they ascend chiefly through their ownpowers of motion. They certainly have this Ovum of Rabbit. contauiii to a remarkable extent, for there are ,. Zona pelluJida. 2. Ti,e germs, con- numerous cases on record in which imprep;- ?hung °f two wge ceils, several . , , . , l ~1 smaller cells, and .spermatozoa. nation has occurred without penetration, and even when the hymen was quite entire, and in which the semen has sim-ply been deposited on the exterior of the vulva; in such cases, whichare far from uncommon, the spermatozoa must have found their waythrough the whole length of the vagina. It is probable, however, thatunder ordinary circumstances the passage of the spermatic fluid into theuterus is facilitated by changes which take place in the cervix during7 98 PREGNANCY. the sexual orgasm, in the course of which the os uteri is said to dilateand close again in a rhythmical Mode of Impregnation.—The precise method, in which the spermatozoaeffect impregnation was long a matter of doubt. It is now, ho
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
