A system of obstetrics . ameter can be usually readily measured inthe living female, so that by deducting a half inch we can approximateto the true length of the antero-posterior diameter of the superior strait—a matter of no little importance in estimating the extent of deform-ities of the pelvis. From the subpubic ligament to the hollow of thesacrum is four and three-quarter inches. The oblique diameter of thepelvis is measured from the tuberosity of the ischium of one side tothe sacro-iliac symphysis of the opposite side at the superior strait; itis six inches. The height of the arch of the
A system of obstetrics . ameter can be usually readily measured inthe living female, so that by deducting a half inch we can approximateto the true length of the antero-posterior diameter of the superior strait—a matter of no little importance in estimating the extent of deform-ities of the pelvis. From the subpubic ligament to the hollow of thesacrum is four and three-quarter inches. The oblique diameter of thepelvis is measured from the tuberosity of the ischium of one side tothe sacro-iliac symphysis of the opposite side at the superior strait; itis six inches. The height of the arch of the pubis is two inches. Thelimbs of the arch, formed by the ischio-pubic rami, are two and a halfinches long. THE PELVIS. 551 The Pelvis Covered by the Soft is not sufficient to study the bony pelvis alone, however, if wewish to form correct ideas of the pelvis during labor. The changesproduced in the form and dimensions of the pelvis of the living femaleby the soft parts require our special attention. Fig. The Pelvis, with Soft Parts (bladder, rectum, uterus, and its appendages having been removed).(From a model in the University of Pennsylvania.) The superior pelvis, continuous above with the abdominal cavity,encloses and supports the mass of intestines and affords attachmentsby its walls to two orders of muscles, the one destined to form theenclosure of the cavity, the other filling the iliac fossa. These latterare, on cither side, the iliacus internus and the psoas magnus change both the shape and size of the superior strait, the oneoccupying the iliac fossa, the other descending from the sides of thelumbar vertebrae. These two muscles, surrounded and confined bytheir aponeuroses, form a sort of cushion on either side, and thus fur-nish an admirable support to the pregnant uterus, and by the elasticity 552 MECHANISM AND TREATMENT OF LABOR. of their structures protect it from the violence of shocks and jars towhich it is constantly exposed. Notwit
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
