The incus is one of the three small bones located in the middle ear. It’s nickname is the “anvil” because it is anvil-shaped.
The three small bones of the middle ear are collectively called the ossicles. When sound wave vibrations hit the eardrum, these three small bones vibrate within the middle ear space to transmit sound to the inner ear. If any one of the three bones of the ossicular chain are not functioning, a conductive hearing loss will result.