A manual of practical obstetrics . • Exceptional Six positions of face presentations. LEFT MENTO-ANTERIOR POSITION. 197 The number of positions, like those of the occiput, is four,as follows: 1. Chin to left acetabulum (left mento anterior), L. M. A. 2. Chin to right acetabulum (right mento-anterior), R. M. A. 3. Chin to right sacro-iliac synchondrosis (right mentopos-terior), R. M. P. 4. Chin to left sacro-iliac synchondrosis (left mento-poste-rior), L. M. P. The directly antero-posterior positions of face presentations,as seen in Figs. 61 and 62, are so extremely rare as to be
A manual of practical obstetrics . • Exceptional Six positions of face presentations. LEFT MENTO-ANTERIOR POSITION. 197 The number of positions, like those of the occiput, is four,as follows: 1. Chin to left acetabulum (left mento anterior), L. M. A. 2. Chin to right acetabulum (right mento-anterior), R. M. A. 3. Chin to right sacro-iliac synchondrosis (right mentopos-terior), R. M. P. 4. Chin to left sacro-iliac synchondrosis (left mento-poste-rior), L. M. P. The directly antero-posterior positions of face presentations,as seen in Figs. 61 and 62, are so extremely rare as to bealmost never met with in practice. They are, however, pos-sible, and when they occur, are spontaneously converted intoone of the other four positions (represented by Figs. 57, 58,59, and 60) during the progress of labor. (Note.—The relative frequency of the several positions hasnot been positively ascertained, but the mento-posterior posi-tions are more frequent than the mento-anterior ones. Whilethe four positions of the face have been name
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