A treatise on the science and practice of midwifery . the feet slip out, unless the legs are com-pletely extended upon the childs abdomen. The shoulders soonfollow, lying in the left oblique diameter of the pelvis. The leftshoulder rotates forwards behind the pubis, where it becomes fixed,the right shoulder sweeping over the perineum, and being bornfirst. The arms of the child are generally found placed upon itsthorax, and are born before the shoulders. Sometimes they are ex-tended over the childs head, thus causing considerable delay, andgreatly increasing the risk to the child. It is now gen
A treatise on the science and practice of midwifery . the feet slip out, unless the legs are com-pletely extended upon the childs abdomen. The shoulders soonfollow, lying in the left oblique diameter of the pelvis. The leftshoulder rotates forwards behind the pubis, where it becomes fixed,the right shoulder sweeping over the perineum, and being bornfirst. The arms of the child are generally found placed upon itsthorax, and are born before the shoulders. Sometimes they are ex-tended over the childs head, thus causing considerable delay, andgreatly increasing the risk to the child. It is now generally ad-mitted that such extension is most apt to occur when traction hasbeen made on the childs body with the view of hastening delivery,and that it is rarely met with when the expulsion of the body is leftentirely to the natural powers. Delivery of the Head.—When the shoulders are expelled the headenters the pelvis in the opposite, or right oblique diameter, the facelooking to the right sacro-iliac synchondrosis. As the greater part Fig. Passage of the Shoulders and Partial Rotation of the Thorax. of the child is now expelled, and as the head has entered the vagina,the uterus, having a comparatively small mass to contract upon,must obviously act at a mechanical disadvantage. Still the pressureof the head on the vagina is a powerful inciter, the accessory muscles 292 LABOR. of parturition are brought into strong action, and there is usuallyquite sufficient force to insure expulsion of the head without artificialaid. On account of the great resistance to the descent of the occiputfrom its articulation with the spinal column, the pains have the Fig.
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
