A treatise on the science and practice of midwifery . Dorso-anterior Presentation of the Arm. uterus has probably some influence, since the early pains mightcause the presenting part to hitch against the pelvic brim, and the Fig. Dorso-posterior Presentations of the Arm, shoulder to descend. An unusually low attachment of the placentato the inferior segment of the uterine cavity has been mentioned asa predisposing cause. In consequence of this the head does not lie 312 LABOR. so readily in the lower uterine segment, and is apt to slip up intoone of the iliac fossae. This is supposed to e
A treatise on the science and practice of midwifery . Dorso-anterior Presentation of the Arm. uterus has probably some influence, since the early pains mightcause the presenting part to hitch against the pelvic brim, and the Fig. Dorso-posterior Presentations of the Arm, shoulder to descend. An unusually low attachment of the placentato the inferior segment of the uterine cavity has been mentioned asa predisposing cause. In consequence of this the head does not lie 312 LABOR. so readily in the lower uterine segment, and is apt to slip up intoone of the iliac fossae. This is supposed to explain the frequency ofarm presentation in cases of partial or complete placenta and Wigand believe that shoulder presentations are favoredby irregularity in the shape of the uterine cavity, especially a rela-tive increase in its transverse diameter. This theory has been gene-rally discredited by writers, and it is certainly not susceptible ofproof; but it seems far from unlikely that some peculiarity of shapemay exist, not capable of recognition, but sufficient to influence theposition of the foetus. How otherwise are we to explain those remark-able cases, many of which are recorded, in which similar malposition
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
