I'm guessing that the stapes vibrate against the cochlea. :)
The stapes or stirrup is the small bone in the middle ear.
The stapedius muscle is attached to the stapes. It is the smallest striated muscle in the human body.
STAPES
The oval window sits immediately behind the stapes, in the middle ear.
Stapes
I am not sure what the purpose of the stapes are but i know that they are one of the innermost smaller bones in our body and they are shaped somewhat like a stirrup.
Ear.
stapes
Stapedius
stapes ligament
stapes