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Most of the neurons of the central nervous system are in the brain. The brain leads to a brain stem, which in turn connects to the spinal cord, from which nerve travel all over the body. There are also nerves which do not pass through the spine but which connect the brain directly to various parts of the head, including the optic nerve which goes to the eyes, and the auditory nerve which goes to the ears. In addition to the central nervous system there is also an autonomic nervous system which is centered in the solar plexus; it is kind of an auxiliary brain for the digestive system.

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12y ago

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