#vestibular_apparatus__vestibular_system  organs mediating the labyrinthine sense; concerned with equilibrium
  supertype:  #sensory_system__sensorysystem  the body's system of sense organs
  part:  #ear  the sense organ for hearing and equilibrium
     part:  #vestibule_of_the_ear  the central cavity of the bony labyrinth of the ear
     part:  #eardrum__tympanum__tympanic_membrane__myringa  the membrane in the ear that vibrates to sound
        part:  #umbo  a slight rounded elevation where the malleus attaches to the eardrum
     part:  #organ_of_hearing  the part of the ear that is responsible for sensations of sound
     part:  #fenestra  a small membrane-covered opening (especially one in the bone between the middle and inner ear)
     part:  #auricular_artery__auricularartery__arteria_auricularis__arteriaauriculari  artery that supplies blood to the ear
  part:  #semicircular_canal  one of three tube loops filled with fluid and in planes nearly at right angles with one another; concerned with equilibrium

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