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
Hammers Over the Anvil Hammers Over the Anvil Hammers Over the Anvil is a 1993 Australian biographical romantic drama film starring Russell Crowe and directed by Ann Turner. The screenplay was written by Peter Hepworth and Ann Turner. The film is loosely based on the novel by Alan Marshall. The original music score is composed by Not Drowning, Waving. Based on the novel of the same name by Alan Marshall, the film is set in the early 1900s in a small town in the Western District of Victoria, centering around a young Alan Marshall and the people in his town. Crippled by polio, Alan