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
Anvil (band) the band recorded with Chris Tsangarides, who previously produced their acclaimed 1982 album "Metal on Metal". After failing to find a major label that was willing to distribute the band's new material, the album, titled "This Is Thirteen", was self-released in 2007, and was available exclusively from the band's official website. The band's history has been documented in the documentary film "Anvil! The Story of Anvil" released in 2008. The film has received high praise which has put Anvil back into the public consciousness, propelling them to play several festivals including the Download Festival in 2009 at which they headlined