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        | Ganglia: A collection of neuron cell bodies in the PNS |  | 
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        | CNS Gray Matter Organization: |  | Definition 
 
        | Neural Cortex, Centers,Nuclei, High Centers |  | 
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 | Definition 
 
        | Gray matter on the surface of the brain |  | 
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 | Definition 
 
        | Collections of neuron cell bodies in the interior of the CNS |  | 
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 | Definition 
 
        | Collections of neuron cell bodies; each center has specific processing functios |  | 
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 | Definition 
 
        | The most complex centers in the brain |  | 
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        | White Matter Organization |  | Definition 
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 | Definition 
 
        | Bundles of CNS axons that share a common origin, destination, and function |  | 
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 | Definition 
 
        | Several tracts that form an anatomically distinct mass |  | 
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        | Columns and tracts that connect the brain with other organs and systems in the body |  | 
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