neurons

• label the structure of a neurone (motor neurone)

  A = dendrite

  B = nucleus

  C = cell body

  D = myelin sheath

  E = Nodes of Ranvier

  F = axon terminal

  
• outline neural transmission

  1. a positive charge arrives at the dendrites
  2. an action potential is triggered in the cell body once the threshold is reached
  3. action potential travels down axon towards axon terminal
  4. the axon terminal connects the neurone to another neurone to begin synaptic transmission
• describe the differences between sensory, relay and motor neurones

  • sensory has short axons and long dendrites
  • relay has short axons and short dendrites
  • motor has long axons and short dendrites
• where are sensory neurones located?

  in the peripheral NS in clusters
• what is the function of sensory neurones?

  • carries messages from the the peripheral NS, for example: eye, mouth, tongue, etc.
  • carries the messages to the central NS
• what is the function of relay neurones?

  • carries nerve impulses between neurones
  • connects sensory and motor neurones
• where are relay neurones located?

  • located between the sensory and motor neurones
  • mostly found in the brain and spinal cord
• where are motor neurones located?

  • the cell body is located in the central NS
  • the axon is located in the peripheral NS
• what is the function of the motor neurone?

  • carries nerve impulses from the central NS to an effector, such as a muscle
  • controls muscle movement