. Obstetrics: the science and the art. ng a childof moderate size almost as speedily and safely, in sucli a labor, as if itwere a vertex presentation. Let it be remembered that the symphysisof the pubis is only one inch and a half long, often not so much, and,of course, if the chin should escape under the arch, the neck is so longthat the throat can apply itself against the inside of the symphysis,allowing the chin, nay, the whole head to be born before any partof the thorax of the infant begins to plunge into the excavation. 640. Figure 82 may serve to show how the chin, in a favorablecase, c
. Obstetrics: the science and the art. ng a childof moderate size almost as speedily and safely, in sucli a labor, as if itwere a vertex presentation. Let it be remembered that the symphysisof the pubis is only one inch and a half long, often not so much, and,of course, if the chin should escape under the arch, the neck is so longthat the throat can apply itself against the inside of the symphysis,allowing the chin, nay, the whole head to be born before any partof the thorax of the infant begins to plunge into the excavation. 640. Figure 82 may serve to show how the chin, in a favorablecase, comes, at last, to the symphysis pubis, slides down behind it,and at length begins to emerge underneath the crown of the pubalarch. Look at the figure; reflect that the occipito-mental diameteris five inches and a half, and the pelvis only four and a half; andthat, as soon as the chin begins to come forward under the arch,the five inch mento-occipital diameter is coming, with its mentalextremity, out beneath the arch. Fig. 82. Fig.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectobstetrics, bookyear1
