. The science and art of midwifery . sible, or in faulty positions, such as theanterior dip of the head in justo-minorpelves, and the presentation of the posteriorparietal bone in the flattened varieties. Thus, version is indicated in contractedpelves only where the childs heart heatswith nearly unimpaired vigor and in pelvesmeasuring between two and three quartersand three and a half inches antero-pos-teriorly, with the contraction limited to thebrim, and with suilicient amplitude in thetransverse diameter. The advantages of version in contracted pelves grow out of the unquestioned fact that
. The science and art of midwifery . sible, or in faulty positions, such as theanterior dip of the head in justo-minorpelves, and the presentation of the posteriorparietal bone in the flattened varieties. Thus, version is indicated in contractedpelves only where the childs heart heatswith nearly unimpaired vigor and in pelvesmeasuring between two and three quartersand three and a half inches antero-pos-teriorly, with the contraction limited to thebrim, and with suilicient amplitude in thetransverse diameter. The advantages of version in contracted pelves grow out of the unquestioned fact that the after-coming head passes more readily the contracted brim than the normal head-firstpresentation This superior facility is attributable to the entry of the head by its smaller bimastoid diameter. At, the same time, the fronto-OCCipital descends in the transverse diameter of the pelvis. The press-ure of the conjugate is encountered by the bitemporal diameter of the childs head, which measures a half-inch less than the FIG. ; of skull. M M,bimastoid diameter, TREATMENT OF CONTRACTED PELVES. 505 Tractions upon the trunk of the child Bring to hear simultaneouslypressure upon the head from many points in the pelvic walls. As aresult, bilateral flattening is effected, and a deep groove, usually near thecoronal suture, is produced in many cases upon the posterior cranialsurface by the pressure of the projecting promontory. The hulk of thehead is still further diminished by an overriding of the bones at theBagittal suture, and, where the transverse diameter is insufficient, bythe crowding of the occipital beneath the parietal bones. A reductionof the cranial contents is brought about by the retreat of a consider-ate portion of the cerebro-spinal fluid into the spinal canal. All thesechanges are induced rapidly, and are not dependent upon the activityand strength of the uterine pains. The method of performing version and extraction in contractedpelves is, wi
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