E.5a Brain Structure

pupil reflex: when a bright light shines into one eye, the pupils of both eyes normally constrict

  • retina detects light intensity
  • impulses to brain in optic nerve
  • brain stem/medulla controls the reflex
  • sympathetic system causes dilation
  • parasympathetic system causes constriction
  • sympathetic neurons are in spinal nerve T1
  • parasympathetic neurons are in cranial nerve III
  • pre- and postganglionic fibers of symp/parasymp
  • neurotransmitters of symp/parasymp
  • polysynaptic reflex
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