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Sound. How You Hear Sound. How Does It Work???. You are sound asleep. Suddenly, your alarm goes off and you jump awake. How does your brain receive this information?. Function. Gather sound waves & send information about sound to your brain Three main sections all with different functions

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sound

Sound

How You Hear Sound

how does it work
How Does It Work???
  • You are sound asleep. Suddenly, your alarm goes off and you jump awake.
  • How does your brain receive this information?
function
Function
  • Gather sound waves & send information about sound to your brain
  • Three main sections all with different functions
    • Outer Ear
    • Middle Ear
    • Inner Ear
outer ear
Outer Ear
  • Part you see
  • Acts like a funnel
  • Collects sound waves & directs them into narrow region called ear canal
    • Few cm long
    • Ends at eardrum
  • Eardrum – small, tightly stretched, drumlike membrane
    • Sound waves make eardrum vibrate
middle ear
Middle Ear
  • Behind eardrum
  • Contains 3 smallest bones in body
    • Hammer, anvil, stirrup
  • Hammer attached to eardrum
    • When eardrum vibrates, hammer does too
    • Transmits vibrations first to anvil then stirrup
inner ear
Inner Ear
  • Membrane separates middle ear from inner ear
  • When stirrup vibrates against membrane, vibrations pass into cochlea – fluid filled cavity shaped like a snail shell
    • Contains more than 10,000 tiny hair cells
inner ear cont
Inner Ear Cont.
    • Hair like projections float in fluid in cochlea
    • When vibrations move through fluid, hair cells move, causing messages to be sent to the brain through the auditory nerve
  • Brain then processes messages and tells you what you heard
hearing loss
Hearing Loss
  • If loss of hearing occurs may have difficult time hearing soft sounds or high-pitched sounds
  • Can be caused by
    • Injury
    • Infection
    • Exposure to loud sounds
    • aging
causes of hearing loss
Causes of Hearing Loss
  • Can occur if eardrum damaged or punctured
  • Infections can damage inner ear
  • Excessive loud music can damage hair cells so can no longer send signals to brain
  • As age, some hair cells die in cochlea and never replaced