Abstract # 2943 Poster # 50:

Scheduled for Thursday, June 17, 2010 07:00 PM-09:00 PM: Session 11 (Medallion Ballroom C/D/E/F) Poster Presentation


STUDY OF CORPUS CALLOSUM OF THE SPIDER MONKEY (ATELES GEOFFROYI) USING MAGNETIC RESONANCE IMAGING.

D. Platas
Instituto de Investigaciones Antropológicas (Postgraduate program), Universidad Nacional Autónoma de México, Circuito exterior s/n, Ciudad Universitaria, Coyoacan, Mexico, DF 04510, Mexico
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Due to its size and weight, the spider monkey (Ateles geoffroyi) is considered to have the most developed brain of the New World monkeys. Magnetic resonance imaging offers a noninvasive tool to study the Ateles’ brain to elucidate morphological structures related to cognitive abilities. A previous study has been reported on imaging the brain of a spider monkey, and motivated further investigation with a higher field MRI. We acquired ex-vivo brain images of a spider monkey. T2-weighted images of an Ateles’ brain were studied using a 3T Achieva-Phillips scanner. Anatomical structures were identified using the biplanar method provided by the software tool Osirix and Paxinos and Logothetis atlas. Despite the fact that we acquired postmortem brain tissue images, it was possible to pinpoint some important structures including the corpus callosum. The structures were compared by different observers using Cronbach's α reliability index with a coefficient of 0.99. We are interested in the phylogeny of the corpus callosum due to its importance in the connection of both cerebral hemispheres, and transferring information from one hemisphere to the other.