The effective diameter of the tympanic membrane -
Area of tympanic membrane is 90 mm2.
Effective area is 55 mm2 (approximately 2/3rd of the total area).
Significance of large area of tympanic membrane – The area of tympanic is much larger than area of stapes footplate, which helps in converting sound of greater amplitude but lesser force to that of lesser amplitude and great force.
25 mm2
30 mm2
40 mm2
45 mm2