Hi...as far as I am aware it is the ear drum that vibrates........... the sound having been collected by the visible part of the ear then directed through the ear canal to the ear drum thus causing the anvil, the hammer and the stirrup (the 3 bones in the ear) to vibrate......... hope this helps
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I think, I'm not sure if it is the eardrum...
That's why I came on wikianswers to see the answer.
lol