The Peripheral Nervous System

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  • Created on: 31-05-22 12:40
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  • The Peripheral Nervous System
    • The PNS transmits messages, via millions of neurons to and from the CNS
    • Somatic nervous system
      • responsible for controlling muscle movement and receiving information from sensory receptors
      • involved in reflex actions without the involvement of the CNS, which allows the reflex to occur very quickly
      • The SNS carries commands from the motor cortex
    • Autonomic nervous system
      • governs the brain’s involuntary activities and is self-regulating
      • Controls vital functions in the body such as breathing, heart rate, digestion, sexual arousal and stress responses
      • The ANS control centres are in the brain stem
      • Parasympathstic branch
        • relaxes the body. Known as the ‘rest and digest’ response
      • Sympathetic branch
        • arouses the body. Known as the ‘fight or flight’ response
    • somatic nervous system and the autonomic nervous system both contain sensory and motor nerves
      • Sensory (afferent) nerves transmit impulses from peripheral organs to the CNS.
      • Motor (efferent) nerves transmit impulses from the CNS out to the peripheral organs to cause an effect or action.
    • Difference between ANS and SNS
      • ANS: Involuntary, Controls muscles, internal organs and glands of the body, Control centres are in the brain stem.
      • SNS: Voluntary, Controls skeletal muscles and movement Controls skeletal muscles and movement, Carries commands from the motor cortex.


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