. An American text-book of obstetrics. For practitioners and students. Fig. 176.—Form of membranes during dilata-tion, watch-glass (Varnier): the presenting part islarge and fills the cervix (one-sixth natural size). Fig. 177.—Form of membranes with less effi-cient filling of cervix and pelvis, and larger quan-tity of fore-waters (modified from Varnier). in shape when the cervix is narrow and the presenting part does not fill it, asin knee or shoulder presentations (Fig. 178) ; (5) pear-shaped (Fig. 179), as THE PHYSIOLOGY OF LABOR. 331 where the fetus is dead and macerated;15 (6) double, as w
. An American text-book of obstetrics. For practitioners and students. Fig. 176.—Form of membranes during dilata-tion, watch-glass (Varnier): the presenting part islarge and fills the cervix (one-sixth natural size). Fig. 177.—Form of membranes with less effi-cient filling of cervix and pelvis, and larger quan-tity of fore-waters (modified from Varnier). in shape when the cervix is narrow and the presenting part does not fill it, asin knee or shoulder presentations (Fig. 178) ; (5) pear-shaped (Fig. 179), as THE PHYSIOLOGY OF LABOR. 331 where the fetus is dead and macerated;15 (6) double, as with twins—but veryrarely. The membranes are slightly permeable under pressure (Tarnier and Pinard),and at times the amnion will leak into the chorion, giving a double of the vaginal flow has been credited to this source. The cervix and lower uterine segment are drawn up over the protrudedovum. The chorion often separates from the decidua. The attachment of.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
