Nervous System

• Why are neurones described as polarised?

  There's an input & an output

  
• How do neurones link to other neurones or muscle cells?

  Through synapses by releasing chemical neurotransmitters
• Vertebrates have a dorsally positioned...

  Spine (Spinal cord protected by vertebral column)

  
• What are cranial nerves?

  Spinal nerves coming from the brain
• What is ascending/ sensory afferent information?

  Information coming from external environment & received into body & communicated toward CNS
• What is motor (efferent) information?

  Information travelling away from the CNS