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The middle ears of 10 adult cadavers aged 74.70 ± 14.56 years were bilaterally dissected with the help of an endoscope and microscope to measure the exact distance of tympanic nerve to round screen niche and oval screen. Tympanic nerve was found as 1.60 ± 0.86 mm (range, 0-3.11 mm) and 1.55 ± 0.38 mm (range, 1.04-2.20 mm) away from round screen niche and oval window, correspondingly. In terms of the quantitative values of those 2 distances, neither right-left