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      The Role of the Corticospinal Tract in the Evolution of Human Digital Dexterity

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          Abstract

          A morphometric analysis of the corticospinal tract's relation to digital dexterity was performed on 21 species theoretically related to man's ancestral lineage. The results indicate that the Primate line is not unique among mammals with respect to the cortical control of digital dexterity. A comparative analysis suggests that two changes took place early in Primate evolution: a reduction in functional distance (i.e. number of synapses) between neocortex and spinal motor neurons innervating the digits, and an extension of direct neocortical influence beyond the cervical segments of the spinal cord. A further change progressed throughout Primate evolution, from the mid-Eocene to the present, in which the overall size of the corticospinal tract increased steadily as though consolidating the cortical influence over body musculature, especially that of the digits.

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          Author and article information

          Journal
          BBE
          Brain Behav Evol
          10.1159/issn.0006-8977
          Brain, Behavior and Evolution
          S. Karger AG
          0006-8977
          1421-9743
          1983
          1983
          18 March 2008
          : 23
          : 3-4
          : 165-183
          Affiliations
          aBureau of Child Research, University of Kansas, Parsons, Kans.; b Department of Psychology, Florida State University, Tallahassee, Fla., USA
          Article
          121494 Brain Behav Evol 1983;23:165–183
          10.1159/000121494
          6667369
          3afe5778-bd6a-415f-bc39-ea2166b97035
          © 1983 S. Karger AG, Basel

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          History
          Page count
          Pages: 19
          Categories
          Paper

          Geriatric medicine,Neurology,Cardiovascular Medicine,Neurosciences,Clinical Psychology & Psychiatry,Public health
          Evolution,Primates,Pyramidal tract,Corticospinal system,Digital dexterity

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