the nervous system

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  • Created by: imyimss
  • Created on: 02-10-18 12:05
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  • THE NERVOUS SYSTEM
    • the nervous system is divided into the:
      • PERIPHERAL NERVOUS SYSTEM
        • SOMATIC NERVOUS SYSTEM
        • AUTONOMIC NERVOUS SYSTEM
          • SYMPATHETIC NERVOUS SYSTEM
          • PARASYMPATHETIC NERVOUS SYSTEM
    • CNS
      • SPINAL CORD
        • relay info from brain to the rest of the body
          • circuit of nerves for reflexes so doesn't have to involve brain - quick response
        • monitor and regulate bodily processes
          • connected to different parts of the body by pairs of spinal nerves which connect to specific muscles and glands
          • bundle of nerve fibres enclosed within spinal column and which connect nearly all parts of body to brain
    • human nervous system in complex network of nerve cells that carry messages to and from the brain and spinal cord to different parts of the body / help communication
    • PERIPHERAL NERVOUS SYSTEM
      • AUTONOMIC NERVOUS SYSTEM (ANS)
        • governs brains involuntary activities and is self-regulating
          • divided into sympathetic and parasympathetic
        • SYMPATHETIC NERVOUS SYSTEM (SNS)
          • fight or flight response
            • increased heart rate allows for greater blood flow to skeletal muscles
              • pupils dilate - let in more light for better vision
                • bronchial tubes in lungs dilate for greater oxygen intake
                  • adrenal medulla stimulated to release adrenaline
                    • glycogen in liver is converted to glucose for energy
                      • digestive system and saliva production is stopped
                        • sweat glands stimulate to produce more sweat
          • neurons travel from SNS to virtually every organ / gland to prepare for rapid action
        • PARASYMPATHETIC NERVOUS SYSTEM (PNS)
          • relaxes the body once the emergency has passed
            • slows the heart rate back to normal
              • involved in energy conservation and digestion
  • CENTRAL NERVOUS SYSTEM (CNS)
    • the nervous system is divided into the:
      • PERIPHERAL NERVOUS SYSTEM
        • SOMATIC NERVOUS SYSTEM
        • AUTONOMIC NERVOUS SYSTEM
          • SYMPATHETIC NERVOUS SYSTEM
          • PARASYMPATHETIC NERVOUS SYSTEM
    • SPINAL CORD
    • BRAIN
  • BRAIN
    • CNS
      • SPINAL CORD
        • relay info from brain to the rest of the body
          • circuit of nerves for reflexes so doesn't have to involve brain - quick response
        • monitor and regulate bodily processes
          • connected to different parts of the body by pairs of spinal nerves which connect to specific muscles and glands
          • bundle of nerve fibres enclosed within spinal column and which connect nearly all parts of body to brain
    • CEREBRUM
      • CEREBELLUM
        • DIENCEPHALON
          • BRAIN STEM
            • regulating automatic functions essential for life
              • breathing, heartbeat, swallowing
          • thalamus - relay station for nerve impulses
            • hypothlamus - regulating internal conditions (body temp.)
        • controlling motor skills and balance
          • coordinating muscles
      • divided into 4 lobes with different functions
        • two halves - celebral hemispheres
          • two halves communicate through corpus callosum
    • responsible for coordinating sensations, intellectual and nervous activity
  • two halves - celebral hemispheres
    • two halves communicate through corpus callosum
  • thalamus - relay station for nerve impulses
    • hypothlamus - regulating internal conditions (body temp.)
  • part of peripheral nervous system responsible for carrying sensory and motor info to and from CNS
    • SOMATIC NERVOUS SYSTEM
      • reflex actions without involvement of CNS - quick reflex
      • motor neurones - info form CNS to other areas of body
      • sensory neurones - messages to the CNS
      • PERIPHERAL NERVOUS SYSTEM
        • AUTONOMIC NERVOUS SYSTEM (ANS)
          • governs brains involuntary activities and is self-regulating
            • divided into sympathetic and parasympathetic
          • SYMPATHETIC NERVOUS SYSTEM (SNS)
            • fight or flight response
              • increased heart rate allows for greater blood flow to skeletal muscles
                • pupils dilate - let in more light for better vision
                  • bronchial tubes in lungs dilate for greater oxygen intake
                    • adrenal medulla stimulated to release adrenaline
                      • glycogen in liver is converted to glucose for energy
                        • digestive system and saliva production is stopped
                          • sweat glands stimulate to produce more sweat
            • neurons travel from SNS to virtually every organ / gland to prepare for rapid action
          • PARASYMPATHETIC NERVOUS SYSTEM (PNS)
            • relaxes the body once the emergency has passed
              • slows the heart rate back to normal
                • involved in energy conservation and digestion

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