The principles and practice of obstetrics . at Inferior Strait Fig 132. at orifice of Vagm&. T Sinclairs M PROGNOSIS. 333 tations, the tracheal region of the neck is fixed at thesub-pubic ligament, while the process of flexion takesplace. There is, mechanically, therefore, so far as thediameters of the head are concerned, no real differencebetween the two presentations. It is a matter of littleimportance, whether the trachelo-bregmatic or cervico-bregmatic is engaged at the inferior strait, and at theorifice of the vagina. It should be remarked, however,that,in vertex presentations, it is the
The principles and practice of obstetrics . at Inferior Strait Fig 132. at orifice of Vagm&. T Sinclairs M PROGNOSIS. 333 tations, the tracheal region of the neck is fixed at thesub-pubic ligament, while the process of flexion takesplace. There is, mechanically, therefore, so far as thediameters of the head are concerned, no real differencebetween the two presentations. It is a matter of littleimportance, whether the trachelo-bregmatic or cervico-bregmatic is engaged at the inferior strait, and at theorifice of the vagina. It should be remarked, however,that,in vertex presentations, it is the oecipito-mentaldiameter which corresponds to the axis, of the obstet-ric canal, while, in nasal presentations, the occipito-frontal diameter corresponds to this axis, from thecommencement to the termination of this process. The head being thus born, in a state of great flexion,in this fourth position, restitution immediately occurs,if the neck be twisted; and the chin will point towardthe left groin, and the occiput toward the right tuberof the ischium. Under thi
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Keywords: ., boo, bookcentury1800, booksubjectobstetrics, booksubjectpregnancy
