The practice of obstetrics, designed for the use of students and practitioners of medicine . Fig. 568.—Central Separation of thePlacenta from the Uterine Wall,WITH the Formation of a Retropla-cental Blood-mass. (Schultzes mech-anism.) Fig. 569.—Descent of the PlacentaDoubled upon Itself, with the CenterOF THE Fetal Surface Presenting.(Schultzes ). Fig. 570.—Descent of the Placenta withTHE Lower Border First, through theCervix and Vagina. (Duncans mech-anism.) Fig. 571.—Complete Separation of thePlacenta. The placenta is expelled flatwith the lower margin first presenting.(Duncans me
The practice of obstetrics, designed for the use of students and practitioners of medicine . Fig. 568.—Central Separation of thePlacenta from the Uterine Wall,WITH the Formation of a Retropla-cental Blood-mass. (Schultzes mech-anism.) Fig. 569.—Descent of the PlacentaDoubled upon Itself, with the CenterOF THE Fetal Surface Presenting.(Schultzes ). Fig. 570.—Descent of the Placenta withTHE Lower Border First, through theCervix and Vagina. (Duncans mech-anism.) Fig. 571.—Complete Separation of thePlacenta. The placenta is expelled flatwith the lower margin first presenting.(Duncans mechanism.) its firm but elastic structures bulge with every uterine contraction and recedewith its subsidence. The pelvic floor directs the presenting part upward andforward toward the orifice of the vulva. Mucus lubricates both the passagesand fetus, and thus the vagina more easily allows the onward movement of thefetus. Between the pains the soft parts press back the fetus till the presentingpart is so firmly fastened under the symphysis pubis that this cannot the vulva gapes; the presenting part is seen; the anus relaxes and the THE STAGES OF LABOR. 439 rectal wall appears; there is an uncontrollable desire to micturate and defecate,due to pressure on bladder and rectum; there comes the crowning effort, and thehead passes through
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
