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| thin membrane separating the middle ear from the inner part of the external auditory canal |
| short auditory canal in the petrous portion of the temporal bone |
oval window n.
An oval opening located on the medial wall of the tympanic cavity, leading into the vestibule, to which the base of the stapes is connected and through which the ossicles of the ear transmit the sound vibrations to the cochlea. Also called fenestra of vestibule.