types of Neurons

• Main types of neuron

  • Sensory
  • Relay
  • Motor
• Sensory neurons

  • Carry impulses from receptors to the CNS
• Relay neurons

  • Found entirely within the CNS
  • Connect sensory and motor neurons
• Motor neurons

  • Carry impulses from the CNS to effectors
  • Large cell body at one end
  • Nucleus always in its cell body
  • Many highly branched dendrites
• Cell body

  The part of the neuron that contains the nucleus
• Dendrites

  Extensions from the cell body that receive signals from other neurons
• Motor neurons structure

  • Large surface area for the axon terminal of other neurons
• Sensory neurons structure

  • Same basic structure as motor neurons
  • Cell body branches off in the middle
  • May be near source of stimuli or in a swelling of a spinal nerve known as the ganglion
• Ganglion

  A swelling of a spinal nerve