. The science and art of midwifery. Figs. 101, 102.—Diagrammatic representations of sections through the infantile and adult pelves. (Schroeder.) ricular surfaces. But, when we bear in mind the inclination of thepelvis, it is obvious that pressure from above must act upon the sa-crum likewise in a downward, forward, and inward direction. Now, ifthe sacrum were, as it is sometimes represented, the key-stone of thepelvic arch, its position would be fixed between the ilia. We owe toDuncan,* however, the demonstration that this view is incorrect, andthat in reality the sacral articulation slopes b
. The science and art of midwifery. Figs. 101, 102.—Diagrammatic representations of sections through the infantile and adult pelves. (Schroeder.) ricular surfaces. But, when we bear in mind the inclination of thepelvis, it is obvious that pressure from above must act upon the sa-crum likewise in a downward, forward, and inward direction. Now, ifthe sacrum were, as it is sometimes represented, the key-stone of thepelvic arch, its position would be fixed between the ilia. We owe toDuncan,* however, the demonstration that this view is incorrect, andthat in reality the sacral articulation slopes backward and inward inthe direction of the median line. The fact that the sacrum does notunder pressure drop from the arch is due to the strong sacro-iliacligaments, which hold it in position as part of the bony ring. Theligaments do not, however, prevent the sacrum from sinking forwardto a limited extent into the pelvic cavity, as is shown in the projectionbackward at maturity of the tuberosities of the ilia, whereas in theinfant
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Keywords: ., bookcentury1800, bookdecade1890, bookidsci, booksubjectobstetrics
