. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 182 PELVIS. line of thoracic vertebra to the right side, and is calculated to keep the line of the whole spinal column in equivalent relation to the di- rect and perpendicular line of gravity. It is an interesting question, how far this common ten- dency of the lumbar curve influences the po- sition of the fetal head, by affording more room for the sinciput at the right sacro-iliac joint, and determining its long axis in the left oblique diameter, which is generally allowed to be the most frequent presentation. In by Air
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 182 PELVIS. line of thoracic vertebra to the right side, and is calculated to keep the line of the whole spinal column in equivalent relation to the di- rect and perpendicular line of gravity. It is an interesting question, how far this common ten- dency of the lumbar curve influences the po- sition of the fetal head, by affording more room for the sinciput at the right sacro-iliac joint, and determining its long axis in the left oblique diameter, which is generally allowed to be the most frequent presentation. In by Air the greater number of all kinds of pelvic deformity that have come under my own ob- servation, the projection of the sacral promon- tory, when present, has been towards the left side, showing the effect of a natural and previ- ously existing tendency when the supporting structures have been softened by disease. To this subject I shall presently have occasion again to advert. In these cases of partial distortion of the pelvic brim, the cavity and inferior outlet are generally roomy, shallow, and open. Often the transverse or antero-posterior diameter of the inferior outlet is larger than natural, and the pelvis then approaches the condition of the complete ovate deformity. An important prac- tical result of this fact is, that in these defor- mities of the brim all operations for extraction of the foetus "per vias naturales" are facilitated and rendered more successful. The obstruc- tion being simply and only at the brim, when that is overcome the rest is easy. Two examples of deformity of the brim are recorded bv Dr. Ramsbotham. One is pre- served in the Museum of the London Hospital (see fig. 114".). The conjugate diameter of 114. its diameters, but more especially at the brim. The conjugate diameter is 2± inches only ; the transverse 4f inches; and while the dis- tance from the right side of the sacral promon- tory to the right pubic ramus is 2£ inches, that
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