oval window (fenestra ovalis) A membrane-covered opening between the middle ear and the inner ear (see ear), situated above the round window. Vibrations of the tympanum are transferred across the middle ear by the ear ossicles and transmitted to the inner ear by the oval window, which is connected to the third ear ossicle (stapes). See also vestibular canal.
oval window (oh-văl) n. see fenestra (ovalis).
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