![]() Even more, its neuroanatomy remains poorly understood. The study of this genera has increased in recent years, but overall understanding of the Ateles evolution and ecology is based predominantly on behavioral and ecological studies. Furthermore, it possesses one of the largest and most developed brain among the New World monkeys. Īteles is one of the most extensive primate genera in America. In this context, the study of the tractography of the corpus callosum is fundamental in the knowledge of the evolution of lateralized structures and functions of the cerebral cortex. Hemispheric dominance and lateralization phenomenon are correlated to increasingly independent hemispheres. This is caused by a reduction of inter-hemispheric connections since the mid-sagittal area of the corpus callosum is smaller in primates with large brains. The tendency of brain volume to increase introduced potential connectivity problems for regions that are functionally linked but located in different anatomical hemispheres. Īmong primates, the anterior region of the CC is linked to the marked expansion of the frontal lobe. The growth of corpus callosum is associated with the reduction of the hippocampus and modifications of other structures, including the reduction of the anterior commissure, the elongation of the superior and inferior fibers of the fornix, and the expansion of the cerebral cortex. In placental mammals, during brain development, the corpus callosum arises from dorsal commissures. This structure plays a central role in mediating complex behaviors and in the integration of hemispheric information between heterotopic and homotopic regions. The corpus callosum (CC) is an organized system of fiber tracts that provides inter-hemispheric connectivity between the frontal, parietal, temporal and occipital cortices. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are creditedĭata Availability: All relevant data are within the paper and its Supporting Information files.įunding: This work was supported by the Council for Science and Technology, Mexico (CONACYT) (project 109147) and Fulbright-COMEXUS (grant to DPN) ( The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.Ĭompeting interests: The authors have declared that no competing interests exist. Received: JAccepted: DecemPublished: February 18, 2015Ĭopyright: © 2015 Platas-Neri et al. PLoS ONE 10(2):Īcademic Editor: Maurice Ptito, University of Montreal, CANADA ![]() While this study had a small sample size, the results provided important information concerning the organization of the corpus callosum in spider monkeys.Ĭitation: Platas-Neri D, Hidalgo-Tobón S, da Celis Alonso B, de León FC-P, Muñoz-Delgado J, Phillips KA (2015) Tractography of the Spider Monkey ( Ateles geoffroyi) Corpus Callosum Using Diffusion Tensor Magnetic Resonance Imaging. Analyses indicated that approximately 57% of the fibers projects to the frontal cortex and 43% to the post-central cortex. The lowest fractional anisotropy corresponded to projections to motor and sensory cortical areas. The highest fractional anisotropy values corresponded to regions projecting from the corpus callosum to the posterior cortical association areas, premotor and supplementary motor cortices. No statistical difference was reached when comparing this parameter between the different CC regions (p = 0.066). Measurements of the diffusion properties of corpus callosum fibers exhibited a similar pattern to those reported in the literature for humans and chimpanzees. A repeated measure (n = 3) of fractional anisotropy values was obtained of each subject and for each callosal subdivision. We hypothesized that the arrangement of fibers in spider monkeys would be similar to that observed in other non-human primates. Non-invasive magnetic resonance imaging and diffusion-tensor imaging were obtained from three subjects using a 3T Philips scanner. The objective of this research was to describe the organization, connectivity and microstructure of the corpus callosum of the spider monkey ( Ateles geoffroyi).
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