» For the record label, see Incus Records. The incus or anvil is the anvil-shaped small bone or ossicle in the middle ear. It connects the malleus to the stapes. It was first described by Alessandro Achillin of Bologna. The incus transmits sound vibrations from the malleus to the stapes. The incus only exists in mammals, and is derived from a reptilian upper jaw bone, the quadrate bone. Additional images Image:Gray43.png|Head and neck of a human embryo eighteen weeks old, with Meckel’s… (More on Incus)