The Ear Sense of Hearing Notes 1 Hearing

The Ear & Sense of Hearing Notes

1. Hearing Sound • _______ is produced when vibrates something _____. Hearing is the _______ sense that lets • _____ sound us experience _______.

A. Structure of the Ear: • 3 main sections: outer, middle and inner ear. ____ o Outer ear: external ear and ____ ear _______ canal

eardrum and ear: _____ three tiny bones outer § Eardrum separates ______ middle ear from the ____ thin flexible – Eardrum: ____________ when membrane that vibrates sound waves hit it. o Middle Anvil Stirrup Hammer

§ Three tiny bones called the _____, hammer the ______ anvil and the ____. stirrup

auditory nerve o Inner ear: cochlea & ________ § _____ Cochlea is a fluid-filled structure shaped like a snail shell. It is what translates _______ sound vibrations into _______ nerve _____ impulses so the brain can understand sounds.

§ Auditory nerve ____ carries the nerve _____ impulses from the cochlea to the ______. brain

• Label the structures of the ear. semicircular canals stirrup auditory nerve anvil external ear hammer cochlea eardrum eustachian tube ear canal

B. How Sense of Hearing Works: External ear • _______ traps sound waves and funnels them down ear canal to the middle the ______ ear.

• Sound waves cause the eardrum to vibrate. _____ • The eardrum vibrates the anvil and stirrup. hammer, ______,

• The fluid in stirrup vibrates _____ cochlea which stimulates the _____, _______ nerve endings.

• Nerve endings send impulses by the auditory _____ brain for nerve to the ______ interpretation as sound.

how we hear sounds CLICK HERE to see an animation of the ear

Click here to see a video on how we hear sounds.