stapes

/stey-peez/US // ˈsteɪ piz //UK // (ˈsteɪpiːz) //

镫骨,钉书钉,钉子,钉书针

Definitions

n.名词 noun

1
plural sta·pes, sta·pe·des [stuh-pee-deez]. /stəˈpi diz/. Anatomy.
- : the innermost, stirrup-shaped bone of a chain of three small bones in the middle ear of humans and other mammals, involved in the conduction of sound vibrations to the inner ear.

The third ear-ossicle of mammals, the stapes, comes not from the first arch but from the second.
Even then it may be anatomically impossible to see the stapes.
In the latter (Ambystoma) the nerve is beneath, and in the former (Rana) above, the stapes.
Sometimes the term columella is used to include the whole ossicular chain,—the columella together with the stapes.
The stapes is very much like a reptilian columella, having a single crus with no perforation.