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How You Hear Sound
EQ: How do you hear sound?
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The Ear
• There are three main sections of the ear:– Outer Ear– Middle Ear– Inner Ear
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Outer Ear – Funnels sound waves
1. Curved section of ear collects sound
2. Ear canal – funnels sound to the ear drum. Few centimeters long
3. Eardrum – small, tightly stretched, drum like membrane. Sound waves make it vibrate
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Middle Ear
Contains the body’s three smallest bones
hammer
anvil
stirrup
The hammer is attached to the ear drum. When the eardrum vibrates, the hammer does too. Then the hammer hits the anvil and shakes the stirrup
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Inner Ear
Cochlea – cavity shaped like a snail shell, that is filled with liquid. Inside it is filled with more than 10,000 hairs.
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Inner Ear
When the stirrup vibrates against the membrane, the vibrations pass into the cochlea. As the liquid moves, the hairs sway back and forth. The nerve endings attached to the hairs send a message to the brain …sound has arrived!
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Hearing Loss
• Occurs from injury, infection or aging
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“Old MacDonald ... Had Two Ears”
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Verse One
Old MacDonald Had Two EarsE… I… E… I… …O
Three parts each so he could hearE… I… E… I… …O
With an outer ear, middle earInner ear hear, Inner ear there
Here an ear, there an earEverywhere an ear, ear
Old MacDonald Had Two EarsE… I… E… I… …O
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Sound Waves enter the outer earE… I… E… I… …O
They hit the drum and it is clearE… I… E… I… …O
With a Wave, Wave here and a Wave, Wave thereHere a Wave, there a Wave, everywhere a Wave, Wave
An outer ear, middle earInner ear hear, Inner ear there
Here an ear, there an earEverywhere an ear, ear
Sound waves enter the outer earE… I… E… I… …O
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Vibrations move the little bones E… I… E… I… …OMoving fluid so we hear tones E… I… E… I… …O
With a Whoosh, Whoosh here, and a Whoosh, Whoosh thereHere a Whoosh, there a Whoosh, Everywhere a Whoosh, Whoosh
Wave, Wave here and a Wave, Wave thereHere a Wave, there a Wave, everywhere a Wave, Wave
An outer ear, middle ear Inner ear hear, Inner ear thereHere an ear, there an ear Everywhere an ear, ear
Vibrations move the little bones E… I… E… I… …O
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This moving fluid signals my brain E… I… E… I… …OI hear the sound of a jet airplane E… I… E… I… …O
With a Zoom, Zoom here, and a Zoom, Zoom thereHere a Zoom, there a Zoom, everywhere a Zoom, Zoom
Whoosh, Whoosh here, and a Whoosh, Whoosh thereHere a Whoosh, there a Whoosh, Everywhere a Whoosh, Whoosh
Wave, Wave here and a Wave, Wave thereHere a Wave, there a Wave, everywhere a Wave, Wave
An outer ear, middle ear Inner ear hear, Inner ear thereHear an ear, there an ear Everywhere an ear, ear
Sound Waves signal my own brain!!!E… I… E… I… …O !!
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Class Work and Homework
• Fill In – What did I learn– Confused– Say– Read pages O 62 – O 64– Questions 1-5, page O 64