components

• central nervous system


  control centre for the body, consists of the brain and spinal cord
• spinal cord connects the brain by long lines of individual nerve cells, to every area in the body
• spinal cord


  protected by specialised bones named vertebrae, bones have hollow centre through which spinal cord runs, transmits information to and from brain through nerves
• autonomic system


  controls and regulates processes such as heart rate and gut movement (peristalsis), these actions are unconsciously controlled
• sensory neurons (somatic nervous system)


  sensory nerves transmit information from the senses to brain
• motor neurons (somatic nervous system)

  motor neurons transmit information to the muscles from the brain
• sensory and motor nerve pathways work together, for example when picking up something, such as a pen
• peripheral nervous system

  all nerves outside nervous system make peripheral nervous system, relays information from brain and spinal cord to rest of body