Medicine & Health
How does the ear work?
The ear works by turning sound waves into electrical signals the brain understands. Sound funnels in and vibrates the eardrum; tiny bones amplify those vibrations into the fluid-filled cochlea, where hair cells convert them into nerve signals sent to the brain.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how the ear works.
Step by step
- 1The outer ear funnels sound waves to the eardrum, making it vibrate.
- 2Three tiny bones in the middle ear (the smallest bones in the body) amplify those vibrations.
- 3The vibrations pass into the cochlea, a fluid-filled spiral in the inner ear.
- 4Hair cells in the cochlea convert the vibrations into electrical nerve signals.
- 5The auditory nerve carries those signals to the brain, which interprets them as sound.
Frequently asked questions
- How does the ear turn sound into something the brain understands?
- Hair cells in the cochlea convert sound vibrations into electrical signals, which the auditory nerve carries to the brain to be interpreted as sound.
- How does the ear help with balance?
- Beyond hearing, the inner ear contains fluid-filled canals that sense head movement and position, giving the brain the information it needs to keep you balanced.
- Why do ears pop on a plane?
- Air-pressure changes push on the eardrum. The Eustachian tube opens (often when you swallow or yawn) to equalize the pressure, which you feel as a 'pop'.