---------Nervous System----------
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        |                                 |
        |                                 |
Peripheral System                  Central System
        |
        |
        |----------------------------------
        |                                 |
        |                                 |
 Somatic System                    Autonomic System
                                          |
                                          |
        ----------------------------------|
        |                                 |
        |                                 |
Sympathetic System              Parasympathetic System