A textbook of obstetrics . Fig. 295.—Generally equally contracted rachitic pelvis (authors collection). Characteristics of the Flat, Generally Contracted RachiticPelvis.—The sacrum is pressed forward and downward betweenthe iliac bones, and is rotated on its transverse axis, mainly bythe pressure of the trunk upon it, but partly by the pull down-. ing. 296.—Flat rachitic pelvis, with unusual descent of the promontory, rotation ofthe sacrum, and lordosis (Mutter Museum, College of Physicians, Philadelphia . ward of the psoas muscles upon the spinal column and the pullupward upon the posterior s
A textbook of obstetrics . Fig. 295.—Generally equally contracted rachitic pelvis (authors collection). Characteristics of the Flat, Generally Contracted RachiticPelvis.—The sacrum is pressed forward and downward betweenthe iliac bones, and is rotated on its transverse axis, mainly bythe pressure of the trunk upon it, but partly by the pull down-. ing. 296.—Flat rachitic pelvis, with unusual descent of the promontory, rotation ofthe sacrum, and lordosis (Mutter Museum, College of Physicians, Philadelphia . ward of the psoas muscles upon the spinal column and the pullupward upon the posterior surface of the sacrum by the erectoresspinae muscles (Fig. 294). The effect of this movement wouldnaturally be to throw the tip of the sacrum and the coccyx 44- THE PATHOLOGY OF LA FOR. directly backward, so that the posterior surface of the sacralhone would run an almost horizontal course as the woman stoodupon her feet. The attachments of the sacrosciatic ligamentsand muscles to the lower sacrum and coccyx, however, preventthis backward movement of the bone as a whole, and, pullingthe lower portion of the bone forward, cause a sharp bend in it,usually at the junction of the fourth and fifth sacral sacrum is narrowed in its transverse diameter, and the lateral concavity of theanterior surface is effacedby the forward moveme
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Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
