Neurons

    Cards (13)

    • Cell body
      • Dendrites
      • Axon
    • Sensory neurons

      • Carry electrical impulses towards the brain
      • Found in the PNS
    • Sensory neurons
      • Have long dendrites
      • Have short axon
    • Relay neurons

      • Have cell body
      • Carry signals
      • Allow sensory and motor neurons to communicate
    • Relay neurons are only found in the brain/visual system/spinal cord
    • Relay neurons
      • Have short dendrites
      • Have short axons
      • Do not have a myelin sheath
    • Motor neurons
      Carry Motor commands FROM the CNS to EFFECTORS (skeletal muscles/organs/gland) which allows for movement
    • Motor neurons
      • Have short dendrites and long axons (for sending messages)
      • Cell bodies are in the CNS
      • Have long axons that also connect to the PNS
    • sensory, relay and motor neurons work together
    • For example, if someone picks up a hot pan and then drops it
    • SENSORY receptors in the fingers sense the heat and send that information via the peripheral nervous system to the CNS
    • RELAY
      neurons would be involved in analysing the sensation of heat and pain, and are involved in the decision to let go - passing messages to the
    • MOTOR
      neurons which instruct the effectors to let go of the hot pan
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