EQ: How do you hear sound? How You Hear Sound EQ: How do you hear sound?

The Ear There are three main sections of the ear: Outer Ear Middle Ear Inner Ear

Outer Ear – Funnels sound waves Curved section of ear collects sound Ear canal – funnels sound to the ear drum. Few centimeters long Eardrum – small, tightly stretched, drum like membrane. Sound waves make it vibrate

Middle Ear Contains the body’s three smallest bones 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 anvil stirrup hammer

Inner Ear Cochlea – cavity shaped like a snail shell, that is filled with liquid. Inside it is filled with more than 10,000 hairs.

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!

Hearing Loss Occurs from injury, infection or aging

“Old MacDonald ... Had Two Ears”

With an outer ear, middle ear Verse One Old MacDonald Had Two Ears E… I… E… I… …O Three parts each so he could hear E… I… E… I… …O With an outer ear, middle ear Inner ear hear, Inner ear there Here an ear, there an ear Everywhere an ear, ear Old MacDonald Had Two Ears

Sound Waves enter the outer ear E… I… E… I… …O They hit the drum and it is clear With a Wave, Wave here and a Wave, Wave there Here a Wave, there a Wave, everywhere a Wave, Wave An outer ear, middle ear Inner ear hear, Inner ear there Here an ear, there an ear Everywhere an ear, ear Sound waves enter the outer ear

Vibrations move the little bones E… I… E… I… …O Moving fluid so we hear tones E… I… E… I… …O With a Whoosh, Whoosh here, and a Whoosh, Whoosh there Here a Whoosh, there a Whoosh, Everywhere a Whoosh, Whoosh Wave, Wave here and a Wave, Wave there Here a Wave, there a Wave, everywhere a Wave, Wave An outer ear, middle ear Inner ear hear, Inner ear there Here an ear, there an ear Everywhere an ear, ear Vibrations move the little bones E… I… E… I… …O

This moving fluid signals my brain E… I… E… I… …O I hear the sound of a jet airplane E… I… E… I… …O With a Zoom, Zoom here, and a Zoom, Zoom there Here a Zoom, there a Zoom, everywhere a Zoom, Zoom Whoosh, Whoosh here, and a Whoosh, Whoosh there Here a Whoosh, there a Whoosh, Everywhere a Whoosh, Whoosh Wave, Wave here and a Wave, Wave there Here a Wave, there a Wave, everywhere a Wave, Wave An outer ear, middle ear Inner ear hear, Inner ear there Hear an ear, there an ear Everywhere an ear, ear Sound Waves signal my own brain!!! E… I… E… I… …O !!

Class Work and Homework Fill In What did I learn Confused Say Read pages O 62 – O 64 Questions 1-5, page O 64