The practice of obstetrics, designed for the use of students and practitioners of medicine . ws the Pubic Arch.—(Front theauthors lead-tape tracings.) 382 PHYSIOLOGICAL LABOR. The Pelvic Cavity.—The pelvic cavity, pelvic canal, excavation, small ortrue pelvis, is the portion bounded by the inlet above, the outlet below, infront by the symphysis pubis, at the sides by the innominate bones, and behindby the hollow of the sacrum and the coccyx. The pelvic cavity is irregularlybarrel-shaped or cylindrical. It must never be forgotten that the pelvis offersa curved and not a straight cylinder to dea
The practice of obstetrics, designed for the use of students and practitioners of medicine . ws the Pubic Arch.—(Front theauthors lead-tape tracings.) 382 PHYSIOLOGICAL LABOR. The Pelvic Cavity.—The pelvic cavity, pelvic canal, excavation, small ortrue pelvis, is the portion bounded by the inlet above, the outlet below, infront by the symphysis pubis, at the sides by the innominate bones, and behindby the hollow of the sacrum and the coccyx. The pelvic cavity is irregularlybarrel-shaped or cylindrical. It must never be forgotten that the pelvis offersa curved and not a straight cylinder to deal with—a cylinder bent upon itself,so to speak. If this fact be overlooked, the most important factor in deter-mining the mechanism of delivery is ignored. This cavity may be convenientlyseparated into four regions: anterior, posterior, and two lateral (Figs. 509to 511). The anterior region has a marked notch in the pubic arch. Thesurface is convex from above downward, and concave from side to side. Inthe middle of this region the posterior part of the articulation of the symphysis. Fig. 513.—The Superior Surface of the Pelvis showing the Shape and Diameters OF THE Pelvic Inlet. pubis projects vertically and makes a prominence of from i to | of an inch( to I cm.). Toward the sides the surface is smooth, and then come theinternal obturator or sub-pubic fossas. The posterior region consists of thesurfaces of the sacrum and coccyx. This part is concave from above down-ward, the curve being deepest at the junction of the second and third sacralvertebrae. Down to this point the curve is very fiat; which makes the axisof the cavity straight above this level. The lateral regions consist of twowell-defined parts; the anterior being entirely bony and corresponding to theposterior part of the acetabula and to the ischial body and tuberosity; andits direction is from above downward, from without inward, and from behindforward. The posterior part consists for the most part of t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
