Description:
The eardrum is a thin membrane that separates the external ear from the middle ear. In this diagram, it is shown in light blue. When sound waves hit the ear drum, it vibrates, and passes on its vibration to three bones inside the middle ear. These bones are called the hammer, anvil and stirrup, and they pass the vibration on to the cochlea. The cochlea is the yellow, shell-like piece of the diagram. It is filled with a liquid and many tiny hairs. When made to vibrate by the stirrup, the liquid in the cochlea forces these tiny hairs to move. This causes a nerve pulse to be made, which is then sent to the brain and decoded as sound.
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