Middle ear to sounds of higher frequency, because these are better taken up by the inner ear (which also responds to higher frequencies than those of non-mammals). The malleus, or "hammer", evolved from the articular bone of the lower jaw, and the incus, or "anvil", from the quadrate. In other vertebrates, these bones form the primary jaw joint, but the expansion of the dentary bone in mammals led to the evolution of an entirely new jaw joint, freeing up the old joint to become part of the ear. For a period of time, both jaw joints existed together, one medially and one
Ear shaping the ear are amputated to give the desired look. This may also be undertaken to remove stretched portions that are no longer wanted. Sutures or cauterizing may be required. Ear cropping is commonly performed on animals, for both cosmetic and other reasons, but rarely on humans. In humans, cropping usually involves the removal of part of the upper ear with a scalpel. Suturing or cauterizing may be required. Cutting involves removing small portions of tissue or cutting parts of the ear to produce a new shape or a decorative pattern. Ear pointing or "elfing" by various methods is undertaken to