The principles and practice of obstetrics . Rotation. Chest engaged with Head. 1 Sinclairs Ulh,? EXTENSION, 329 Third. This disposition to elongate is, in some de-cree, counteracted by the propelling power of the ute-rus, etc., which, acting from above downward, causesthe descent of the thorax against the head of the child,and, thus, has a tendency to diminish the length of theneck, and to counteract, to a certain degree, the elon-gation produced by the mere fact of extension. Fourth. In cases where the chin is posterior, a por-tion of the thorax of the child may enter the superiorstrait wi
The principles and practice of obstetrics . Rotation. Chest engaged with Head. 1 Sinclairs Ulh,? EXTENSION, 329 Third. This disposition to elongate is, in some de-cree, counteracted by the propelling power of the ute-rus, etc., which, acting from above downward, causesthe descent of the thorax against the head of the child,and, thus, has a tendency to diminish the length of theneck, and to counteract, to a certain degree, the elon-gation produced by the mere fact of extension. Fourth. In cases where the chin is posterior, a por-tion of the thorax of the child may enter the superiorstrait with the occiput, (Plate XXV., Fig. 128,) allow-ing, even in these cases, the face to descend as low asthe perineum. This arises from the fact, that there isconsiderable room at the superior portion of the pelvis,and, also, it is the mere apex of the thorax and theposterior extremity of the occipital bone which wouldbe simultaneously engaged, in the antero-posteriordiameter of the superior strait. A fifth consideration may be added, viz.: That, ifthe
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