Nervous system

• • Central nervous system : brain and spinal cord 
  • has tracts 
  • has white and gray matter
  • Peripheral nervous system: everything outside of brain and spinal cord 
  • has nerves 
  • No gray/white matter 
  • Autonomic nervous system: controls smooth muscles, cardiac muscles, glands.
  • parasympathetic: calms down
  • sympathetic: reacts  
  • Somatic nervous system: controls skeletal muscles
  • Neuroglia 
  • neuron: don’t multiply, send impulses
  • supporting cells: can multiply, don’t send impulses 
• • supporting cells
  • astrocytes: protect neurons from harmful substances, control chemical environment 
  • microglia: dispose of trash 
  • ependymal: circulate spinal fluid, cushions
  • oligodendrocytes: create insulation