A textbook of obstetrics . every force imposed upon them. They bend before thepressure of the trunk from above, the extremities from below, andthe pull of the muscles attached t the pelvic bones. The flexi-bility of the pelvis in extreme eases of osteomalacia may be appre-ciated when it is stated that the superior iliac spines maybe bentbackward until they touch the spinal column ; the horizontalrami of the pubis may be pushed inward until they almost oblit-erate the pelvic inlet ; and the tuberosities of the ischium may ANOMALIES IN THE FORCES 01- LABOR. 45 1 be approximated until they nearly
A textbook of obstetrics . every force imposed upon them. They bend before thepressure of the trunk from above, the extremities from below, andthe pull of the muscles attached t the pelvic bones. The flexi-bility of the pelvis in extreme eases of osteomalacia may be appre-ciated when it is stated that the superior iliac spines maybe bentbackward until they touch the spinal column ; the horizontalrami of the pubis may be pushed inward until they almost oblit-erate the pelvic inlet ; and the tuberosities of the ischium may ANOMALIES IN THE FORCES 01- LABOR. 45 1 be approximated until they nearly elose the pelvic outlet. Notonly are the pelvic walls so compressed that they almost oblit-erate the pelvic canal, but the spinal column also, sinking underthe weight of the trunk, bends far forward and descends low intothe pelvis, occupying the little remaining room in the inlet andcanal, and becoming itself a serious obstruction to the engage-ment of the presenting part. From the lateral pressure of the. Fig. 311.—Minor grade of osteomalacic pelvis.
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
