The principles and practice of obstetrics . Measurements of the Pelvis.—The pelvis has certain measure-ments or dimensions, which the student should clearly understandfor it is upon the correspondence of these measurements with thoseof the foetal head that the facility or difficulty, the possibility orimpossibility, of childbirth will oftentimes depend. Too close atten-tion, therefore, cannot be given to this subject, if you desire to * It is supposed by Velpeau, and others, that the internal iliac and psoas muscleson the sides of the brim, form a sort of cushion for the protection of the impr
The principles and practice of obstetrics . Measurements of the Pelvis.—The pelvis has certain measure-ments or dimensions, which the student should clearly understandfor it is upon the correspondence of these measurements with thoseof the foetal head that the facility or difficulty, the possibility orimpossibility, of childbirth will oftentimes depend. Too close atten-tion, therefore, cannot be given to this subject, if you desire to * It is supposed by Velpeau, and others, that the internal iliac and psoas muscleson the sides of the brim, form a sort of cushion for the protection of the impregnateduterus against the force of concussions, and other injuries; and that this cushioulikewise oreveuts undue pressure on the crural nerves. THE PRINCIPLES AND PRACTICE OF OBSTETRICS. 25 comprehend the beautiful mechanism, which nature has institutedfor the purpose of accomplishing the expulsion of the child throughthe maternal organs. The diameters of the pelvis may be dividedinto those of the upper strait, lower strait, and The upper strait (Fig. 15) presents the following: 1. The antero-posterior, sacro-pubic, or conjugate, each of these names beingapplied to this diameter; it extends from the superior and internalportion of the symphysis pubis to the middle of the sacro-vertebralprominence, and measures four inches; 2. The transverse or bis-iliac diameter, which extends from the prominence on the linea-ileo-pectinea (the line forming the contour or boundary of the brim) tothe corresponding prominence on the opposite side ; it measures, inthe dried pelvis, five inches, but, for practical purposes, it yieldsonly four inches, for the reason that it is abridged, on either side,half an inch in consequence of the presence of the psoas magnusmuscle. You observe, therefore, that these two diameters, theantero-posterior, and transverse, make certain divisions of the supe-rior strait; the former divides it, from before backward, into twoequilateral portions; while the l
Size: 1950px × 1282px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookpubli, booksubjectobstetrics
