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Anatomical and obstetrical mechanics in primates abitbol mm westport connecticutt bergin garvey 1996 237 pages 95 as an intern in obstetrics and gynectology at george wash ington university i spent some of my few off duty hours exploring the smithsonian institution museums in washington dc. Current obstetrical problems have an anthropological origin cesarean section almost unknown at the beginning of the century is now considered necessary in more than 25 of deliveries by studying the evolution of anatomical structures and the mode of delivery among other primates strong reasons are apparent for the present crisis in human . Birth and human evolution anatomical and obstetrical mechanics in primates abitbol mm westport connecticutt bergin garvey 1996 237 pages 95. Oped a narrative describing the evolution of human birth based on rather limited fossil evidence and obser vations about parturition in other primates from this evidence it appears that birth mechanics changed dra matically once our early ancestors developed a bipedal gait but that the rotational obstetrical mechanics char