A treatise on the science and practice of midwifery . ation has takenplace ovulation is suspended. It is, however, certain that none of theseare insuperable obstacles to a second impregnation. The first was orig-inally based on the older and erroneous view which considered the de-cidua to be an exudation lining the entire uterine cavity and sealing upthe mouths of the Fallopian tubes and the aperture of the internal osuteri. The decidua reflexa, however, does not come into apposition withthe decidua vera until about the eighth week of pregnancy, and, there-fore, until that time there is a free
A treatise on the science and practice of midwifery . ation has takenplace ovulation is suspended. It is, however, certain that none of theseare insuperable obstacles to a second impregnation. The first was orig-inally based on the older and erroneous view which considered the de-cidua to be an exudation lining the entire uterine cavity and sealing upthe mouths of the Fallopian tubes and the aperture of the internal osuteri. The decidua reflexa, however, does not come into apposition withthe decidua vera until about the eighth week of pregnancy, and, there-fore, until that time there is a free space between the two membranesthrough which the spermatozoa might pass to the open mouths of theFallopian tube, and in which a newly-impregnated ovule might graftitself. A reference to the accompanying figure of a pregnancy in thethird month, copied from Costes work, will readily show that, as far asthe decidua is concerned, there is no mechanical obstacle to the descentand lodgment of another impregnated ovule (Fig. 80). Then, as regards Fig. Illustrating the Cavity between the Decidua Vera and the Decidua Reflexa during the EarlyMonths of Pregnancy. (After Coste.) the plug of mucus, it is pretty certain that this i- in no way differenlfrom the mucus filling the cervix in the non-pregnant state, which <»n<T-no obstacle at all to the passage of the spermatozoa. Lastly, respectingthe cessation of ovulation during pregnancy, this, no doubt, is the rule,and probably satisfactorily explains the rarity of superfoetation. Thereare, however, a sufficient number of authenticated cases of menstruationduring pregnancy to prove that ovulation is not always absolutely in 172 PREGNANCY. abeyance; and, as long as it occurs, there is unquestionably no positivemechanical obstruction, at least in the early months of pregnancy, in theway of the impregnation and lodgment of the ovules that are thrownoff. The reasonable conclusion, therefore, seems to be that, although alarge majorit
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
