neurones

• motor neurone

  A) direction of nerve impulse

  B) distal end

  C) motor end plate

  D) axon

  E) Node of Ranvier

  F) branches of axon

  G) myelin sheath

  H) cell body

  I) proximal end

  J) dendrite

  
• sensory neurone

  A) distal end

  B) synaptic knob

  C) branches of axon

  D) direction of nerve impulse

  E) node of ranvier

  F) axon

  G) dendron

  H) cell body

  I) dendrite

  J) proximal end

  
• neurone 


  a nerve cell which transmits nerve impulses
• sensory neurones 


  found in the sensory nerves and transmit nerve impulses from receptor cells to the CNS
• relay neurones 


  found in the grey matter of the spinal cord and transmit nerve impulses from the sensory to the motor neurone
• motor neurones 


  found in the motor nerves and transmit nerve impulses from the CNS to the effectors
• relay neurone

  A) dendrites

  B) axon

  C) cell body

  D) direction of impulse

  
• All neurones have a cell body with a nucleus (plus cytoplasm and all the other organelles you usually get in a cell). The cell body has extensions that connect to other neurones - dendrites and dendrons carry nerve impulses towards the cell body (dendrites are smaller branches of a dendron), and axons carry nerve impulses away from the cell body.
• Sensory neurones have short dendrites and one long dendron to carry nerve impulses from receptor cells to the cell body, and one short axon that carries nerve impulses from the cell body to the CNS.
• Motor neurones have many short dendrites that carry nerve impulses from the CNS to the cell body, and one long axon that carries nerve impulses from the cell body to effector cells.
• Relay neurones have many short dendrites that carry nerve impulses from sensory neurones to the cell body, and one axon that carries nerve impulses from the cell body to motor neurones.
• the pathway of nervous communication

  A) stimulus

  B) receptors

  C) sensory neurone

  D) CNS

  E) motor neurone

  F) effectors

  G) response