tympanogram /timpan″əgram/ , a graphic representation of the acoustic impedance and air pressure of the middle ear and the mobility of the tympanic membrane, measured as part of the audiological test battery. In the normal middle ear, the air pressure is the same as the atmospheric pressure, as shown by a peak in the middle of the tympanogram. Various middle ear pathologies such as otitis media, otosclerosis, or tympanic membrane perforations each yield distinctive tympanograms. See also acoustic impedance.
