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stapes In Mammalia, the inner auditory ossicle of the ear, stirrup-shaped because it is pierced by an artery. It is derived from the hyomandibular bone in fish, which connects the cranium and the upper jaw.
stapes (stay-peez) n. a stirrup-shaped bone in the middle ear that articulates with the incus and is attached to the membrane of the fenestra ovalis. See ossicle.
stapes (stirrup) The third of the three ear ossicles of the mammalian middle ear.
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