A treatise on the science and practice of midwifery . of the lower margin of the symphysis pubis and the promontory 44 ORGANS CONCERNED IN PARTURITION. of the sacrum, and averages half an inch more than the antero-posteriordiameter of the brim. These measurements are chiefly of importancein relation to certain pelvic deformities. External Measurements.—The external measurements of the pelvisare of no real consequence in normal parturition, but they may help us,in certain cases, to estimate the existence and amount of which are generally given are: Between the anterior-superio
A treatise on the science and practice of midwifery . of the lower margin of the symphysis pubis and the promontory 44 ORGANS CONCERNED IN PARTURITION. of the sacrum, and averages half an inch more than the antero-posteriordiameter of the brim. These measurements are chiefly of importancein relation to certain pelvic deformities. External Measurements.—The external measurements of the pelvisare of no real consequence in normal parturition, but they may help us,in certain cases, to estimate the existence and amount of which are generally given are: Between the anterior-superioriliac spines, 10 inches; between the central points of the crests of theilia, 10^- inches; between the spinous process of the last lumbar vertebraand the upper part of the symphysis pubis (external conjugate), 7 inches. Planes of the Pelvis.—By the planes of the pelvis are meant imaginarylevels at any portion of its circumference. If we were to cut out a pieceof cardboard so as to fit the pelvic cavity, and place it either at the brim Fig. Axes of the Pelvis. a. Axis of superior plane. b. Axis of mid plane. c. Axis of inferior plane. d. Axis of canal. e. Horizon. or elsewhere, it would represent the pelvic plane at that particular part,and it is obvious that we may conceive as many planes as we of the angle which the pelvic planes form with the horizonshows the great obliquity at which the pelvis is placed in regard to thespinal column. Thus the angle abi (Fig. 9) represents the inclinationto the horizon of the plane of the pelvic brim, I B, and is estimated tobe about 60°, while the angle which the same plane forms with the ver-tebral column is about 150°. The plane of the outlet forms, with thecoccyx in its usual position, an angle with the horizon of about 11°, butwhich varies greatly with the movements of the tip of coccyx and thedegree to which it is pushed back during parturition. These figuresmust only be taken as giving an approximate ide
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
