Volume 1

A treatise on the science and practice of midwifery / by W.S. Playfair.

  • William Smoult Playfair
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on the science and practice of midwifery / by W.S. Playfair. Source: Wellcome Collection.

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    piece of cardboard so as to fit the pelvic cavity, and place it either at the brim 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 desire. Observation of the angle which the pelvic planes form with the horizon shows the great obliquity at which the pelvis is placed in regard to the spinal column. Thus the angle A B I (fig. 9) represents the inclination to the horizon of the plane of the Fig. 9. c n PLANES OF THE PELVIS WITH HOIUZOJf. a p.. Horizon. ca Vertical line. a B r. Angle of Inclination of pelvis to horizon, equal to G0°. r: i c. Angle of inclination of pelvis to spinal column, equal to 150°. o I J. Angle of inclinati if sacrum to spinal column, equal to 130°. f. f. Axis of pelvic inlet. l m. Mid plane in the middle line, tr. Lowest point of mid plane of ischium. pelvic prim, I B, and is estimated to be about 60°, while the angle which the same plane forms with the vertebral column is about 150°. The plane of the outlet forms, with the coccyx in its usual position, an angle with the horizon of about 11°, but which varies greatly with the movements of the tip of coccyx, and the degree to which it is pushed back during parturition. These figures must only be taken as giving an approximate idea of the inclination of the pelvis to tlic spinal column, and it must be remembered thai the