A treatise on the science and practice of midwifery . Commencing Spontaneous Evolution. much of the body of the foetus as the pelvis will contain becomesengaged, and then a movement of rotation occurs, which brings thebody of the child nearly into the antero-posterior diameter of thepelvis (Fig. 113). The shoulder now projects under the arch of the Fig. 114.. Spontaneous Evolution further advanced. pubis, the head lying above the symphysis, and the breech near thesacro-iliac synchondrosis. The shoulder and neck of the child now PRESENTATIONS OF SHOULDER, ETC. 317 become fixed points, round whi
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A treatise on the science and practice of midwifery . Commencing Spontaneous Evolution. much of the body of the foetus as the pelvis will contain becomesengaged, and then a movement of rotation occurs, which brings thebody of the child nearly into the antero-posterior diameter of thepelvis (Fig. 113). The shoulder now projects under the arch of the Fig. 114.. Spontaneous Evolution further advanced. pubis, the head lying above the symphysis, and the breech near thesacro-iliac synchondrosis. The shoulder and neck of the child now PRESENTATIONS OF SHOULDER, ETC. 317 become fixed points, round which the body of the child rotates, andthe whole force of the uterine contractions is expended on thebreech. The latter, with the body, therefore, becomes more andmore depressed, until, at last, the side of the thorax reaches the vulva, and, followed by the breech and inferior extremities, is slowly pushedout (Fig. 114). As soon as the limbs are born the head is easily ex-pelled. The enormous pressure to which the body is subjected in thisprocess can readily be understood. As regards the practical bearingsof this termination of shoulder presentations, all that need be saidis, that, if we should happen to meet with a case in which theshoulder and thorax were so strongly depressed that turniDg wasimpossible, and in which it seemed that nature was endeavori