. The Richmond and Louisville medical journal . iply force. Itis questionable whether such multipli-ers of force can be utilized in dragginga foetus through the bony channel with-out serious injury to both mother andchild, or be made a substitute for thetraction and compression powers of theiorceps. In such case, the power driviDg the foetal head onward, andthe power dragging it forward through the pelvic cavity, to-gether with the counter force acting upon the ischial tuberosi-ties, would be expended upon the framework of the maternalpassage, for the true pelvis would present, at its superior
. The Richmond and Louisville medical journal . iply force. Itis questionable whether such multipli-ers of force can be utilized in dragginga foetus through the bony channel with-out serious injury to both mother andchild, or be made a substitute for thetraction and compression powers of theiorceps. In such case, the power driviDg the foetal head onward, andthe power dragging it forward through the pelvic cavity, to-gether with the counter force acting upon the ischial tuberosi-ties, would be expended upon the framework of the maternalpassage, for the true pelvis would present, at its superior straitor within its cavity, the obstacle to delivery, and at the sametime, at the termini of the transverse and shortest diameter ofthe outlet, the points of counter-resistance. The forces of trac-tion and counter-resistance would necessarily be always equal,and though acting in opposite directions—the first through thewedge-like power of the foetal head, and the latter upon thetuber ischii, transmitted along the ischial rami—would be ex-. OBSTETRICS, ETC. 347 pended upon the pelvic synchondroses, perhaps not often disturb- FlGUEE 6.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmedicine, bookyear187
