The Human Ear

The Human Ear.

The Outer Ear: It acts like a funnel for sound waves. The Pinna coolects sound waves and directs them into the ear canal.

The Middle Ear: Three bones- the hammer, anvil, and stirrup- act  as levers to increase the size of the vibrations.

The Inner Ear: Vibrations created by sound are changed into electrical signals for the brain to interpret.


Inside The Ear: How the Human Ear Works

1. Sound waves vibrate the eardrum- a lightly stretched membrane that is the entrance to the middle ear.
2. The vibration of the eardrum makes the hammer vibrate, which,in turn, makes the anvil and stirrup vibrate.
3. The stirrup vibrates the oval window- the entrance to the inner ear.
4. The vibrations og the oval window create waves in the liquid inside of the cochlea.
5. Movement of the liquid causes tiny hair cells inside the cochlea to bend.
6. The blending og the hair cells stimulates nerves, which send electrical signals to the brain.