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26 Multiple choice questions

  1. The organ which contains about 23,500 hair cells. It is supported by the basilar membrane which, when deformed by pressure, stimulates the hair cells to trigger nerve impulses.
  2. The auditory canal which is approximately 1 inch in length and ends at the eardrum.
  3. The fluid in the cochlear duct.
  4. The process by which sounds are transmitted from the environment to our brains.
  5. A membrane extending across the top of Corti's Organ. When the cilia are deformed by being compressed against this membrane, the hair cells stimulate the auditory nerve to "fire."
  6. The lower level of the cochlea bordered by the helicorema at the apical end, the round window at the base, the cochlear wall and the basilar membrane. It is filled with perilymph.
  7. An apparatus that converts one form of energy into another form. Mechanical energy (vibration) into electromagnetic signals. Ex. microphone.
  8. The external ear
  9. The membrane covering the hair cells, yet allowing the cilia to extend upward through it.
  10. A narrow opening at the apical end of the cochlea joining the scala vestibuli from the scala tympani.
  11. The membrane which divides the scala tympani from the cochlear duct. It is this membrane which supports the Organ of Corti.
  12. The hammer, anvil, and the stirrup: three small bones, each about the size of a grain of rice, through lever action, transmit and increase sound pressure as it travels through the middle ear.
  13. Attached to the hearing apparatus, give feedback on balance.
  14. A tube between the nasopharynx (throat) and the middle ear which keeps air pressure inside the middle ear equalized with that outside.
  15. The eardrum
  16. A tube within a tube lying between the scala vestibuli and the scala tympani. It contains endolymph and houses the Organ of Corti. Along its lower wall is the basilar membrane. Its upper wall is Reissner's membrane.
  17. The membrane separating the middle ear cavity from the scala tympani of the inner ear. The membrane is flexible and will be in opposite phase with the oval window when a tonal stimulus is present.
  18. The microscopic "hairs" of the hair cells extending through the reticular membrane. There are approximately fourteen cilia atop each hair cell.
  19. The area in the base of the cochlea which translates between the semicircular canals and the cochlea.
  20. The membrane between the footplate of the stapes of the middle ear and the scala vestibuli of the inner ear.
  21. The upper level of the cochlea bordered by the oval window at its inception, the helicotrema at the apex, the cochlear wall, and Reissner's membrane. It is filled with perilymph.
  22. A seawater-like fluid in the scala vestibuli, helicotrema and the scala tympani of the cochlea.
  23. Sensory translations of environment signals
  24. From the Latin "apex" meaning tip or end. The small end in the center of the coil of the cochlea, the opposite end of the cochlear base.
  25. That portion of the hearing process which deals with the location of sounds in space by the use of our ears.
  26. The organ of hearing in the inner ear. It is a coiled tube within a tube, which transduces and encodes mechanical vibrations into electrochemical neurological signals.