Main Page | See live article | Alphabetical index 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. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.