. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 74 OBSTETRICS. direction upon the left posterior inclined plane, and falls into the hollow of the sacrum. As the chin emerges, it rises up towards the mons veneris, performing in this case the movement o? flexion, instead of extension, as in vertex cases; the forehead, ibllowed by the sagittal suture and occiput, passes gradually down the plane presented to it by the Fig. 20. anterior surface of the coccyx and perine
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 74 OBSTETRICS. direction upon the left posterior inclined plane, and falls into the hollow of the sacrum. As the chin emerges, it rises up towards the mons veneris, performing in this case the movement o? flexion, instead of extension, as in vertex cases; the forehead, ibllowed by the sagittal suture and occiput, passes gradually down the plane presented to it by the Fig. 20. anterior surface of the coccyx and perineum, in front of which all these parts are succes- sively disengaged. (Fig. 20.) The second position is merely the reverse of the first / the left side is now turned forwards, and the left eye and zygoma are lowest in the pelvis, and the ec- chymosis is found on this side, if the labour is protracted. The chin rotates upon the left anterior inclined plane, and the anterior fonta- nelle on the right pos- terior one: the same diameters correspond, and the labour is completed as in the first position. It is said that this position is more frequent than the former, and that rotation is more readily effected, as the rectum offers no impediment. In all the various positions that have been described or alluded to, the object is to bring the chin to the pubis, and the mechanism is the same as in the two varieties above described. Should this fail, and the chin rotate into the hollow of the sacrum, it is impossible for this part to be born first (unless the foetus be an abortion) ; for the thorax would then be in the pelvis at the same time as the head, and would require assistance to deliver it. These cases will be treated under Preternatural Labour. Diagnosis.—Generally speaking, it is not difficult, although the face has been confounded with the breech. It is generally distin- guished by the prominence and regularity of the features, by the nose, eyes, chin, and mouth ; the latter i
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