A treatise on the science and practice of midwifery . OF THE PELVIS. 381 seems to be that it is the result of the muscular contraction of the rectimuscles at their point of attachment, when the centre of gravity of thebody is thrown backward on account of the projection of the sacral prm-ontory. Sometimes, also, the antero-posterior diameter of the cavity isunusually lessened by the disappearance of the vertical curvature ofthe sacrum, which, instead of forming a distinct cavity, is nearly flat(Fig. 132). Spondylolisthesis.—In a few rare cases, to which attention was firstcalled in 1853 by Kil
A treatise on the science and practice of midwifery . OF THE PELVIS. 381 seems to be that it is the result of the muscular contraction of the rectimuscles at their point of attachment, when the centre of gravity of thebody is thrown backward on account of the projection of the sacral prm-ontory. Sometimes, also, the antero-posterior diameter of the cavity isunusually lessened by the disappearance of the vertical curvature ofthe sacrum, which, instead of forming a distinct cavity, is nearly flat(Fig. 132). Spondylolisthesis.—In a few rare cases, to which attention was firstcalled in 1853 by Kilian of Bonn, a very formidable narrowing of theconjugate diameter of the pelvic brim is produced by a downward dis-placement of the fourth and fifth lumbar vertebrae, which become dislo-cated forward, or, if not actually dislocated, at least separated from theirseveral articulations to a sufficient extent to encroach very seriously onthe dimensions of the pelvic inlet. This condition is known as spondyl-olisthesis[l] (Fig. 133). Fig.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectobstetrics, bookyear1
