The Anatomy of the Ear

When a sound enters the outer ear, it causes the eardrum to vibrate. The sound is transmitted by three small bones from the
middle to the inner ear.

The inner ear contains a snail-like shaped structure called the
cochlea which is filled with fluid and lined with sensory cells
with microscopic fine hairs.

These hairs move with the vibrations and convert the sound
waves into nerve impulses which are sent to the brain.
The result is the sound you hear.