Organising the nervous system

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  • ORGANISATION OF THE NERVOUS SYSTEM
    • CENTRAL NERVOUS SYSTEM
      • BRAIN AND SPINAL CORD
    • PERIPHERAL NERVOUS SYSTEM
      • SOMATIC NERVOUS SYSTEM
        • MOTOR NEURONES CARRY IMPULSES FROM CNS TO SKELETAL MUSCLES - UNDER CONSCIOUS CONTROL
        • MOST NEURONES ARE MYELINATED
        • SOMATIC CONNECTIONS TO EFFECTORS CONSIST OF ONLY ONE NEURONE
      • AUTONOMIC NERVOUS SYSTEM
        • SYMPATHETIC NERVOUS SYSTEM
          • MOST ACTIVE IN TIMES OF STRESS
          • LINKED AT A GANGLION JUST OUTSIDE SPINAL CORD, VERY SHORT
          • POST GANGLIONIC NEURONES SECRETE NORADRENALINE
          • EFFECTS OF THIS ACTION INCLUDE
            • INCREASED HEART RATE
            • PUPIL DILATION
            • INCREASED VENTILATION RATE
            • ORGASM
        • PARA - SYMPATHETIC NERVOUS SYSTEM
          • MOST ACTIVE IN SLEEP AND RELAXTION
          • LINKED AT A GANGLION WITHIN TARGET TISSUE, PRE GANGLIONIC NEURONES VARY IN LENGTH
          • POST GANGLIONIC NEURONES SECRETE ACETYLCHOLINE
          • EFFECTS OF THIS ACTION INCLUDE
            • DECREASED HEART RATE
            • PUPIL CONSTRICTION
            • DECREASED VENTILATION RATE
            • SEXUAL AROUSAL
        • MOTOR NEURONES CARRY IMPULSES FROM CNS TO CARDIAC MUSCLE, TO SMOOTH MUSCLE IN THE GUT - INDEPENDENT OF CONSCIOUS CONTROL
        • HOMEOSTATIC MECHANISMS
        • STRESS RESPONSE
        • MOST NEURONES NON MYELINATED
        • AUTONOMIC CONNECTIONS TO EFFECTORS ALWAYS CONSIST OF AT LEAST TWO NEURONES
      • MADE UP OF NEURONES THAT CARRY IMPULSES INTO AND OUT OF CNS

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