A manual of practical obstetrics . ing part, and certain other given points upon thepelvis. In head presentations the occiput is the given point onthe presenting part, and the given points on the pelvis are thetwo acetabula, and the two sacro-iliac synchondroses. Thus thefour positions of ahead presentation are: 1. Occiput to left acetabulum (left occipitoanterior).1 2. Occiput to right acetabulum (right occipitoanterior). 3. Occiput to left sacro-iliac synchondrosis (left occipito-posterior). 4. Occiput to right sacro-iliac synchondrosis (right occipito-posterior). Very rarely the occiput poi
A manual of practical obstetrics . ing part, and certain other given points upon thepelvis. In head presentations the occiput is the given point onthe presenting part, and the given points on the pelvis are thetwo acetabula, and the two sacro-iliac synchondroses. Thus thefour positions of ahead presentation are: 1. Occiput to left acetabulum (left occipitoanterior).1 2. Occiput to right acetabulum (right occipitoanterior). 3. Occiput to left sacro-iliac synchondrosis (left occipito-posterior). 4. Occiput to right sacro-iliac synchondrosis (right occipito-posterior). Very rarely the occiput points directly in front, to the sym-physis pubis, or directly behind, to the sacral promontory,thus making two more positions (six in all). But these twomay be left out. They usually become converted into one ofthe other four at the beginning of labor. 1 So called because the occiput is pointing to the left and forward. Thesame plan of nomenclature is applied to the other positions. LABOR IN HEAD PRESENTATIONS. 183 Fig. 45. Fig.
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