The two halves of the autonomic nervous system are the sympathetic and parasympathetic nervous systems.
The two fundamental parts of the central nervous system are the spinal cord and the brain.
peripheral nervous system.
The peripheral nervous system is made up of the nerves and ganglia that are not connected to the brain and spinal cord, while the central nervous system is made up of the brain and spinal cord.
The somatic nervous system and the autonomic nervous system are also parts of the peripheral neural system.
The autonomic nervous system also includes the sympathetic and parasympathetic nervous systems. The "fight or flight" reaction is triggered by the sympathetic nervous system. The parasympathetic nerve system controls relaxing and digestive processes.
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