The practice of obstetrics, designed for the use of students and practitioners of medicine . Fig. 522.—Bony Pelvis of a Female Child ofTwo Years. {\ natural size.) — (Authors col-lection.) 392 PHYSIOLOGICAL LABOR. shaped pelvis would be found in both child and adult. The lateral concavity ismuch greater in the infant. The adult pelvis is comparatively widened, since theantero-posterior diameter is lessened. As long as the child is on its back the body-weight exerts no influence. If it were not for the posterior ilio-sacral ligaments,the promontory of the sacrum would press against the posterio
The practice of obstetrics, designed for the use of students and practitioners of medicine . Fig. 522.—Bony Pelvis of a Female Child ofTwo Years. {\ natural size.) — (Authors col-lection.) 392 PHYSIOLOGICAL LABOR. shaped pelvis would be found in both child and adult. The lateral concavity ismuch greater in the infant. The adult pelvis is comparatively widened, since theantero-posterior diameter is lessened. As long as the child is on its back the body-weight exerts no influence. If it were not for the posterior ilio-sacral ligaments,the promontory of the sacrum would press against the posterior surface of thesymphysis pubis. But the posterior part of the innominate bone extends beyondthe spinal column. The ilio-sacral ligaments act as a hinge and tend to spreadout the innominate bones, but this influence is resisted by the heads of thefemora, which press upward and inward. The innominate bones act like atwo-armed lever, with the sacrum as a fulcrum and the two forces—body-. F*G. S^Z-- -BoNY Pelvis of a Female Child of Five Years. collection.) (f natural size.) — {Authors weight and counter-pressure—exerted through the heads of the femora. Sothe iliac bone is bent just in front of the sacrum, thus producing the transversewidening of the superior strait. Another force is the cohesive force offered bythe symphysis pubis, which counteracts the tendency of the ilia to flare reported cases illustrate the effects of the various influences notedabove. Gurlt found a hydrocephalic woman who had always lain in bed. Shewas thirty-one years old when she died. Her pelvis was a model of the infantiletype, though larger in size. The force exerted through the femoral headscannot act without the other forces, so that it never exists alone. Neithercould cohesion offered by the symphysis pubis act alone. Clinically an ex-ample of body-weight acting alone has never been observed. Theoretically THE MUSCLES OF THE PELVIS. 393 it would indicate a split symphysis
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
