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[[Image:Central nervous system.png|thumb|200px|A diagram showing the CNS:<br />'''1.''' Brain<br />'''2.''' Central nervous system<br /> <small>(brain and spinal cord)</small><br>'''3.''' Spinal cord]]
The '''central nervous system''' (CNS) in its most simple divisions consists of all [[nervous tissue]] in the spinal cord and the brain. It is the largest division of the [[nervous system]] and has primary control over all organism behavior.
The '''central nervous system''' (CNS) in its most simple divisions consists of all [[nervous tissue]] in the spinal cord and the brain. It is the largest division of the [[nervous system]] and has primary control over all organism behavior.