A treatise on the science and practice of midwifery . the spine of the mother (Fig. 112). Each of these is sub-divided into two subsidiary classes, according as the head of thechild is placed in the right or left iliac fossa. Thus in dorso-anteriorpositions, if the head lie in the left iliac fossa, the right shoulder ofthe child presents; if in the right iliac fossa, the left. So in dorso-posterior positions, if the head lie in the left iliac fossa, the leftshoulder present; if in the right, the right. Of the two classes thedorso-anterior positions are more common, in the proportion, it issaid
A treatise on the science and practice of midwifery . the spine of the mother (Fig. 112). Each of these is sub-divided into two subsidiary classes, according as the head of thechild is placed in the right or left iliac fossa. Thus in dorso-anteriorpositions, if the head lie in the left iliac fossa, the right shoulder ofthe child presents; if in the right iliac fossa, the left. So in dorso-posterior positions, if the head lie in the left iliac fossa, the leftshoulder present; if in the right, the right. Of the two classes thedorso-anterior positions are more common, in the proportion, it issaid, of two to one. Causes.—The causes of shoulder presentations are not well those most commonly mentioned are prematurity of thefoetus, and excess of liquor amnii; either of these, by increasing themobility of the foetus in utero, would probably have considerable PRESENTATIONS OF SHOULDER, ETC. 311 influence. The fact that it occurs much more frequently amongstpremature births has long been recognized. Undue obliquity of the Fig. 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. 112.
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
