neurones

• features of all neurones:

  • long fibre=axon
  • cell body= contains cellular structures
  • axon terminals=allow neurones to connect to and recieve impulses from other neurones
• myelinated neurones

  • made up of schwann cells wrapped around axons
  • there are uninsulated gaps between cells=nodes of ranvier
  • electrical impulses jump from one node to the next- speeding up impulse transmission
  • schwann cells provide insulation-faster transmission
• sensory neurone


  sends impulses from receptor to the CNS

  • cell body in the middle of the axon
  • dendrites attach to receptors
  • dendron links the axon terminal(at the receptor)with the cell body,delivers electrical impulses to the cell body
  • axon-connects the cell body with the CNS
• relay neurones


  found in the CNS-connect the sensory and motor neurones

  • short neurones with axons
  • highly branched dendrites
• motor neurone


  carries impulses from the CNS to the effector

  • large cell body at one end that lies within the spinal cord or brain
  • many highly branched dendrites extending from cell body-providing many connections with axon terminals of other neurones