Neurones

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  • Neurones
    • Motor Neurone
      • Cell body containing the nucleus and cell organelles within the cytoplasm is located at one end of the neurone
        • Situated within the CNS
      • Has dendrites - very fine stensions that conduct impulses towards the cell body, on the same end as the cell body (i.e. extending from the cell body
      • Axon extends out and conducts impulses from CNS to effectors
      • Also knows as effector neurones
    • Sensory Neurone
      • Cell body containing the nucleus and cell organelles within the cytoplasm extends from the middle of the neurone
      • Carry impulses from sensory cells to the CNS
    • Relay Neurone
      • Cell body containing the nucleus and cell organelles within the cytoplasm is located in the middle of the neurone
      • Found mostly within the CNS
      • Have large numbers of connections with other nerve cells
      • Known as connector neurones and internurones
    • All have a cell body, dendrites (at one end of the neurone), terminal branches (at the other end of the neurone) and an axon - which transmits impulses away from the cell body
      • Axons
        • Surrounded by a fatty insulating layer called the myelin sheath
          • Surrounded by Schwann cells
            • Have nucleus
          • Speeds up nerve impulses

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