The stapes is one of the small bones in the middle ear. Sound waves hit the ear drum and together with the other bones it tends to transmit the vibrations from the ear drum to the cochlea to the...
Stapedius
The stapes transmits the sound vibrations from the incus to the membrane of the inner ear inside the fenestra-ovalis.
The ossicles, which contain the malleus, incus and stapes are found in the middle ear.
Because they are differently shaped, molded to help them survive in their habitats.