The Ear & Sense of Hearing Notes

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

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

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

Three tiny bones called the _________, the ______ and the ________. hammer anvil stirrup

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

Auditory nerve ________ the nerve __________ from the cochlea to the ______. carries impulses brain

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

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

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

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

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

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

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