Question

The surface area of the oval window is ___ of that of the ear drum.

• A.
  $\frac{1}{5}\text{th}$
• B.
  $\frac{1}{10}\text{th}$
• C.
  $\frac{1}{20}\text{th}$
• D. $\frac{1}{25}\text{th}$

Answer 1

The correct option is C

$\frac{1}{20}\text{th}$
The oval window is a membrane covering the head of the cochlea which connects the middle ear and inner ear, through which sound vibrations from stapes are transmitted. The surface area of the oval window is $\frac{1}{20}\text{th}$ of that of the ear drum.