divisions of the nervous system

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  • DIVISIONS OF THE NERVOUS SYSTEM
    • the nervous system
      • system of nerve cells that connects info from world, processes info and transmits electro chemical messages
      • central nervous system
        • the spinal cord
          • receives and transmits info; reflexes
        • the brain
          • all conscious and most unconscious processing
      • peripheral nervous system
        • body wide network of messenger neurones
        • somatic nervous system
          • skeletal muscles (movement); voluntary (under conscious control)
        • autonomic nervous system
          • controls actions of internal organs and glands; involuntary
          • sympathetic
            • releases noradrenaline
            • increases bodily activities
            • fight or flight
          • parasympathetic
            • release of acetylcholine
            • rest and digest
              • decreases HR/BR/sweat; constricts pupils; stimulates digestion
            • decreases bodily activities
            • homeostasis
              • sympathetic
                • releases noradrenaline
                • increases bodily activities
                • fight or flight
              • regulation of internal environment
                • balance between sympathetic and parasympathetic in normal conditions

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