The Stapes reference article from the English Wikipedia on 24-Apr-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Stapes

For people who check facts
The stapes or stirrup is the stirrup-shaped small bone or ossicle in the middle ear which attaches the incus to the fenestra ovalis, the oval window which is adjacent to the vestibule of the inner ear. It is the smallest bone in the human body.

The stapes transmits the sound vibrations from the incus to the membrane of the fenestra ovalis.