#middle_ear__tympanic_cavity__tympanum  the main cavity of the ear; between the eardrum and the inner ear
  supertype:  bodily_cavity__cavity__cavum  (anatomy) a natural hollow or sinus within the body
  part of:  auditory_apparatus
  part:  ossicle__ossiculum  a small bone; especially one in the middle ear
  part:  Eustachian_tube__auditory_tube  either of the paired tubes connecting the middle ears to the nasopharynx; equalizes air pressure on the two sides of the eardrum
  part:  malleus__malleu__hammer  the ossicle attached to the eardrum
  part:  incus__incu__anvil  the ossicle between the malleus and the stapes
  part:  stapes__stirrup  the stirrup-shaped ossicle that transmits sound from the incus to the cochlea

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