A theoretical and practical treatise on midwifery : including the diseases of pregnancy and parturition and the attentions required by the child from birth to the period of weaning . e suddenly during a contraction, with considerable rupture is followed by the escape of a large amount of amniotic fluid, andthe foetus, which was before so high as to be felt with great difficulty, descends,and renders the diagnosis more easy. As soon as the membranes are ruptured, the mechanism of the expulsionbegins, and here, as in the case of the vertex, it is composed of five stages: forced
A theoretical and practical treatise on midwifery : including the diseases of pregnancy and parturition and the attentions required by the child from birth to the period of weaning . e suddenly during a contraction, with considerable rupture is followed by the escape of a large amount of amniotic fluid, andthe foetus, which was before so high as to be felt with great difficulty, descends,and renders the diagnosis more easy. As soon as the membranes are ruptured, the mechanism of the expulsionbegins, and here, as in the case of the vertex, it is composed of five stages: forced extension, the descent, the rotation, the flexion or disengagement,and the external rotation ; these comprise the movements which the head under-goes in face positions. A. Forced Extension.—The head being already moderately extended on theback, its extension will be completed during the first uterine contractions thattake place after the discharge of the waters, owing to the resistance it will thenmeet with. This forced extension of the head changes but very little the rela-tions of its diameters to those of the pelvis (Fig. 70); for instance, the fronto- Fig. 70. Fig.
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Keywords: ., boo, bookcentury1800, booksubjectmidwifery, booksubjectobstetrics
