A textbook of obstetrics . li^. 241. — Breech presentation—rotation ot the hips. 25 386 THE ME CI I AX ISM OF LABOR. entered the pelvis with its long diameters in the oblique diameterof the pelvis, opposite to that in which the shoulders engaged. The head descends the birth-canal to the pelvic floor in aposition of extension. The occiput, which is always the partfirst to strike the pelvic floor, is rotated forward under the. Fig. 242.—JJreech presentation. Waldeyers section of an X-para at full term,who died from hemorrhage some hours after both her legs had been cut oti by a loco-motive : a,
A textbook of obstetrics . li^. 241. — Breech presentation—rotation ot the hips. 25 386 THE ME CI I AX ISM OF LABOR. entered the pelvis with its long diameters in the oblique diameterof the pelvis, opposite to that in which the shoulders engaged. The head descends the birth-canal to the pelvic floor in aposition of extension. The occiput, which is always the partfirst to strike the pelvic floor, is rotated forward under the. Fig. 242.—JJreech presentation. Waldeyers section of an X-para at full term,who died from hemorrhage some hours after both her legs had been cut oti by a loco-motive : a, First lumbar vertebra; b, placenta; c, fractured hist sacral vertebra ; d,coronary vein; c, blood extravasation; / pouch of Douglas; gt cervical canal; //,os externum; r, rectum; /, umbilicus; £,os internum; /, uterovesical reflection ofperitoneum; w, bladder; «, symphysis pubis ; 0, vagina. pubic arch. There follows then the delivery of the head in thefollowing order: Chin, face, forehead, anterior fontanel, sweep-ing successively over the perineum and appearing in the vulvarorifice Prognosis.— The fetal mortality of breech presentations isabout thirty per cent., including badly managed cases in gen- ABNORMALITIES IN MECHANISM. 387 eral practice. There is some added danger of injury to maternalsoft parts, on account of the necessity for rapid and sometimesviolent extraction of the after-coming head. Treatment.
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