Incus(redirected from Incus bone)
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(also anvil), the middle auditory ossicle in mammals. The incus is homologous to the quadrate bone in lower vertebrates. Located in the cavity of the middle ear, it articulates with the malleus at its external end and with the stapes at its internal end. The incus, malleus, and stapes participate in the transmission of sound from the outer ear to the inner ear.