. The science and art of midwifery . raune.) and finally become so dilated that cervix and vagina form one con-t inuous canal. In case the presenting part does not thoroughly tampon the lowersegmenl of the uterus, a more or less complete escape of the entireamniotic fluid may follow the rupture of the membranes. As a rule, the tear in the membranes takes place in the most dependent pointof the Convex portion which constitutes the hair of waters in the cer-vical canal. Sometimes, however, t he rupture takes place above theCervix, where there can be a gradual escape of fluid in spite of the per-
. The science and art of midwifery . raune.) and finally become so dilated that cervix and vagina form one con-t inuous canal. In case the presenting part does not thoroughly tampon the lowersegmenl of the uterus, a more or less complete escape of the entireamniotic fluid may follow the rupture of the membranes. As a rule, the tear in the membranes takes place in the most dependent pointof the Convex portion which constitutes the hair of waters in the cer-vical canal. Sometimes, however, t he rupture takes place above theCervix, where there can be a gradual escape of fluid in spite of the per-sistence of the bag of waters. If the membranes rupture before the dilatation of the cervix iscomplete, the head descends and acts as a dilating wedge. In rare THE PHYSIOLOGY OF LABOK l:;:: cases the rupture of the membranes, if left to nature, does not occur,and the ovum may descend in its integrity to the vulva. In such in-stances the membranes sometimes rupture in the neighborhood of the isms mi plaoent <lu<lenuHi orif. tub. Fig. 66.—The uterus and parturient canal. Foetus removed. (Brauiuv I childs neck, and the head is born covered with the so-called caul/i. e., with the detached portion of the membranes, which old nursesregard as significant of good luck. In still rarer cases, where the foetusis small and the amount of amniotic fluid limited, the entire ovummay be expelled without rupture of its coverings. 2. The Second Stage—The Stage of Expulsion.—After the shortpatise which follows the rupture of the membranes, the pains becomestronger and more frequent, and are now powerfully re-enforced by theinvoluntary contractions of the abdominal muscles, which, though pre-viously not entirely inactive, have played only a subordinate part Witheach pain the head now makes perceptible progress, retreating, however, [34 LABOR. as the pains decline. After the head has passed the pelvic outlet, and iscovered only by the soft parts, the perinsenm bulges outward, the Labiaga
Size: 1522px × 1641px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdec, booksubjectobstetrics, booksubjectwomen
