A treatise on the science and practice of midwifery . ipal varieties of face presenta-tion, viz., the right and left mento-iliac, according as the chin isturned to one or other side of the pelvis. It is better, however, toclassify the positions in accordance with the part of the pelvis towhich the chin points. We may, therefore, describe four positionsof the face, each being analogous to one of the ordinary vertexpresentations, of which it is the transformation. First position.—The chin points to the right sacro-iliac synchon-drosis, the forehead to the left foramen ovale, and the long diamete
A treatise on the science and practice of midwifery . ipal varieties of face presenta-tion, viz., the right and left mento-iliac, according as the chin isturned to one or other side of the pelvis. It is better, however, toclassify the positions in accordance with the part of the pelvis towhich the chin points. We may, therefore, describe four positionsof the face, each being analogous to one of the ordinary vertexpresentations, of which it is the transformation. First position.—The chin points to the right sacro-iliac synchon-drosis, the forehead to the left foramen ovale, and the long diameterof the face lies in the right oblique diameter of the pelvis. Thiscorresponds to the first position of the vertex, and, as in that, theback of the child lies to the left side of the mother. Second position.—The chin points to the left sacro-iliac synchon-drosis, the forehead to the right foramen ovale, and the long diameterof the face lies in the left oblique diameter of the pelvis. This isthe conversion of the second vertex position. Fig. Second Position in Face Presentations. Third position.—The forehead points to the right sacro-iliac syn-chondrosis, the chin to the left foramen ovale, and the long diameterof the face lies in the right oblique diameter of the pelvis. This isthe conversion of the third vertex position. Fourth position.—The forehead points to the left sacro-iliac syn-chondrosis, the chin to the right foramen ovale, and the long dia-meter of the face lies in the left oblique diameter of the pelvis. Thisis the conversion of the fourth vertex position. PRESENTATIONS OF THE FACE. 301 Relative Frequency of these Positions.—The relative frequency ofthese presentations is not yet positively ascertained. It is certainthat there is not the preponderance of first facial that there is of firstvertex positions, and this may, no doubt, be explained by the suppo-sition that an unusual vertex position may of itself facilitate thetransformation into a face pr
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
