. Obstetrics: the science and the art. oon as the occipito-frontal diameterbegins to rest on opposite sides of the pelvic wall; that it descendsrotating, and continues to do so until the crown of the head is pressedagainst the floor of the pelvis, when the rotation is, or rather, oughtto be complete. Hence, I do not admit that there is, within the pelvis,any special plane, whether mid-plane or other that compels the whole trunk of the child, as well as the head, undergoes,the spiral or rotatory motion, and itcannot be that so important a portion of the pelvic function dependsup
. Obstetrics: the science and the art. oon as the occipito-frontal diameterbegins to rest on opposite sides of the pelvic wall; that it descendsrotating, and continues to do so until the crown of the head is pressedagainst the floor of the pelvis, when the rotation is, or rather, oughtto be complete. Hence, I do not admit that there is, within the pelvis,any special plane, whether mid-plane or other that compels the whole trunk of the child, as well as the head, undergoes,the spiral or rotatory motion, and itcannot be that so important a portion of the pelvic function dependsupon the so-called mid-plane. Ipresent in Fig. 16 an illustration toshow that the child is packed upin shape like an olive, and presentsits cephalic or head-pole to theopening. If the head must ofnecessity suffer rotation in its pro-gress, the trunk must do so noless, for this olive-shaped mass,about to be driven through thepelvic canal, is some twelve inchesin length by a little less than fourinches in its transverse diameter. Fig. 60 THE PELVIS. For Taanj yesiis past, I have tauglit at the Jefferson College that of the pelvis are innumerable, and that each and every one ofthem mnst be traversed by the descending foetus, at right angles totheir superficies, and I am greatly obliged to Professor Carus for hissimple and illustrative idea of the Carus curve, which saves me theuseless trouble of calculating the places of the planes, and fully an-swers the demands of the age in the question, what is the axis of thepelvis ? a question to which I have taught many thousands of Ameri-can physicians to answer, it is Caruss curve, which is an arc of avertical circle projected midway between pubis and sacrum, andwhich is the track or orbit in which the centre of the encephalon,or of the trunk of the foetus moves in being born. It might well becalled the foetal orbit. 57. In my view it is pragmatical to pretend to lay down the abso-lute course of a line that should pass perpe
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectobstetrics, bookyear1
