. Obstetrics: the science and the art. ation, is one relative to the part of thefoetus that comes to the opening; while the idea conveyed by theword Position, refers to some relation betwixt a cardinal point onthe walls of the pelvis, and a cardinal point on the presenting , in the pelvis, the cardinal point is always the left aceta-bulum—on the head, the cardinal point is the vertex or the the breech, the cardinal point is the sacrum of the foetus. Forthe shoulder presentation, the cardinal point is the whole head ofthe child. 167. As to the head presentation—it may deviate,
. Obstetrics: the science and the art. ation, is one relative to the part of thefoetus that comes to the opening; while the idea conveyed by theword Position, refers to some relation betwixt a cardinal point onthe walls of the pelvis, and a cardinal point on the presenting , in the pelvis, the cardinal point is always the left aceta-bulum—on the head, the cardinal point is the vertex or the the breech, the cardinal point is the sacrum of the foetus. Forthe shoulder presentation, the cardinal point is the whole head ofthe child. 167. As to the head presentation—it may deviate, and allow a shoulderto come to the os uteri; but this is amere accident of a cephalic presenta-tion; an accident that has arisen fromthe impinging of the head upon themargin or brim of the pelvis, whenceit has glanced upwards to the iliacfossa, permitting the shoulder to takeits place. This is to be seen by inspect-^ing the cut, Fig. 32, in which thechilds head which originally present-ed, has deviated, and gone above the Fig. 90 PKESENTATIONS. Fis. 33. plane of the superior strait, lodging itself in the left iliac fossa, whilethe shoulder has come to the strait, and allowed the arm to cut may serve to show how the hand and arm have merelyprolapsed; making what is commonly denominated an arm presenta-tion : but is it not clear, the head having gone up, that the shoulderstill really presents, and that the arm has only fallen down or pro-lapsed in a shoulder case ? 168. From the above, it appears that we have— 1st. Cephalic presentations;2d. Cephalic presentations deviated,with descent of the shoulder only;and, lastly, 3d. Cephalic presentations deviated,with accidental descent of the shoulder,and prolapse of the arm. 169. Here is a drawing. Fig. 33, re-presenting a breech presentation, orpresentation of the pelvic extremity ofthefoetal ovoid. This is the second nor-mal presentation of the child, the cepha-lic being the first. In this case, anaccidental de
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectobstetrics, bookyear1
