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Central Nervous System S: brain F:Integration - interprets sensory input & decides what should be done Peripheral Nervous System S: 12 pairs of cranial nerves & all branches F:carries sensory impulses to CNS & motor impulses away from CNS Afferent (Sensory) Division S: all sensory neurons F:Sensory Input - carries information from sense organs to CNS Efferent (Motor) Division S: all motor neurons F:Motor Output – causes a response by activating muscles or glands Autonomic Nervous System S: motor neurons connecting to cardiac muscle, smooth muscle & glands F:activates involuntary muscles & glands Sympathetic Nervous System S: sympathetic neurons F:activates organs, glands & muscles involved in Fight or Flight Parasympathetic Nervous System S: parasympathetic neurons F:activates organs, glands & muscles involve in Rest & Digestion Somatic Nervous System S: motor neurons connecting to skeletal muscle F:activates voluntary muscle to contract S: 31 pairs of spinal nerves & all branches S: spinal cord NERVOUS SYSTEM