#fenestra  a small membrane-covered opening (especially one in the bone between the middle and inner ear)
  supertype:  orifice__opening__porta  an aperture or hole opening into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart"
  subtype:  fenestra_ovalis  fenestra_rotunda
  part of:  ear  the sense organ for hearing and equilibrium
     part of:  auditory_system  the sensory system for hearing
     part of:  vestibular_apparatus__vestibular_system  organs mediating the labyrinthine sense; concerned with equilibrium
     part of:  head__caput  the upper or front part of the body in animals; contains the face and brains; "he stuck his head out the window"
        part of:  animal__animate_being__animatebeing__beast__brute__creature__fauna  a living organism characterized by voluntary movement

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