<prompt> Ratio of tympanic members to oval window is17:0122:0150:01:0025:01:00  <response>: According to some workers Wever and Lawrence out of a total of 90 mm2 area of human tympanic membrane, only 55 mm2 is functional and given the area of stapes footplate 3.2 mm2, the areal ratio is 17:1 and total transformer ratio 17x 1.3 is 22.1. Ref: Dhingra 7e pg 17. 