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sound

a disturbance that travels through a medium as a longitudinal wave

compression

where a longitudinal wave presses the medium together

rarefaction

where a longitudinal wave spreads the medium apart

longitudinal wave

a wave in which the particles of the medium vibrate back and forth along the path that the wave travels

outer ear

catches sound

middle ear

transmits the waves inside the ear cavity

inner ear

changes the sound waves into a form our brains can understand

pinna

the part of your ear that acts like a funnel

ear canal

the channel through which sound waves travel

eardrum

a small, tightly stretched, drum-like membrane that vibrates when sound waves enter the ear

cerumen

a waxy substance that coats the inside of the ear canal

Eustachian tube

connects the middle ear to the back of the throat by a small tube

ossicles

three smallest bones of the ear

oval window

the membrane that separates the middle ear from the inner ear

cochlea

a cavity shaped like a snail-shell and filled with liquid

organ of Corti

houses more than 10,000 tiny nerve hairs

auditory nerve

carries impulses from the inner ear to the brain

pitch

a sound is a description of how high or low the sound seems to a person

hertz

measure for frequency

ultrasound

sound waves with frequencies above normal hearing range (above 20,000 Hz)

infrasound

sound waves with frequencies below normal hearing range (below 20 Hz)

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