Neurones

• Structure and Function of Neurones

  - specialised to carry neural info throughout body.

  - 3 types: sensory, relay and motor.

  - typically consist of cell body, dendrites and axon.

  - dendrites - one end of neurone receive signals from other neurones from sensory receptors.

  - cell body - control centre of neurone.
• Sensory Neurones


  - carry nerve impulses from sensory receptors to the spinal cord and the brain

  - convert info from sensory receptors into neural impulses.

  - long dendrites and short axons.

  
• Relay Neurones


  - allow sensory and motor neurones to communicate with each other.

  - lie wholly within the brain and spinal cord.

  - short dendrites and short or long axons.

  
• Motor Neurones


  - located in CNS that project their axons outside CNS.

  - directly or indirectly control muscles.

  - form synapses with muscles and control contractions.

  - when stimulated, neurotransmitters released that bind to receptors on muscle and trigger a response.

  - muscle relaxation is caused by inhibition of motor neurone.

  - short dendrites and long axons.