A text-book of practical obstetrics, comprising pregnancy, labor, and the puerpal state, and obstetric surgery . The Plane and the Axis of the SuperiorStrait, or Pelvic Inlet. The Plane and the Axis of the InferiorStrait, or Pelvic Outlet. MECHANISM OF LABOR. 95 the foetus itself, which must be made to adapt itself to the shapeand the dimensions of the canal through which it must pass. The canal through which the foetus must pass consists ofthe pelvis and of the pelvic floor. The pelvis is divided, froman obstetrical stand-point, into a superior and an inferior por-tion. The superior portion o
A text-book of practical obstetrics, comprising pregnancy, labor, and the puerpal state, and obstetric surgery . The Plane and the Axis of the SuperiorStrait, or Pelvic Inlet. The Plane and the Axis of the InferiorStrait, or Pelvic Outlet. MECHANISM OF LABOR. 95 the foetus itself, which must be made to adapt itself to the shapeand the dimensions of the canal through which it must pass. The canal through which the foetus must pass consists ofthe pelvis and of the pelvic floor. The pelvis is divided, froman obstetrical stand-point, into a superior and an inferior por-tion. The superior portion of the pelvis constitutes what istermed the pelvic inlet, and, except where it is deformed to aconsiderable degree, it does not interfere with the passage of thechild. The dividing line between the superior and the inferiorpelvis is the linea ilio-pectinea. In order to appreciate the mechanism of labor we muststudy the characteristics of these portions of the obstetric pelvis,chiefly what are known as its straits and its planes:— STRAITS OF THE OBSTETRICAL PELVIS. There are two straits,—the superior, or
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Keywords: ., bookcentury1800, bookdecade1890, bookpubli, booksubjectobstetrics
