CS&D 110 Final: FINAL Review - Com Dis(Lecture and Book)
30 Oct 2014
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Document Summary
Putting a brief stimulus in the ear (millisecond or less) causes the basilar membrane to move and hair cells to crunch. The hair cells reverse the sound and the sound that is expelled is the otoacoustic emission. If you get a solid response, you can assume the cochlea is in good shape. You will not have more hearing loss than 35db. Middle ear disorder: otitis media, most common disorder in middle ear. Differences of whether the ear drum is pushed in or what condition it"s in. Cholesteatoma: part of the ear drum forms a pocket that goes inside the ear cavity. Can continue to grow and eat away at the bone that separates the middle ear cavity from the brain. May also eat away at the ossicles, in turn, messing with hearing. Otosclerosis: footplate of the stapes because immobilized in the mobile window. Sometimes the ligament will turn to bone and limit the stapes ability to move.
