The effective diameter of the tympanic membrane is: (A) 25 mm2, (B) 30 mm2, (C) 40 mm2, (D) 45 mm2
Answer is D. Effective diameter or vibratory area of tympanic membrane is 45mm2; Area of tympanic membrane is 90mm2 Stapes footplate area is 3.2mm2 Ref: PL Dhingra 6th edition of Ear, Nose and Throat; pg no 15