How the Ears Work 2025-09-16 ¿ÀÈÄ 4:41:09 À̼öÁø

 

How the Ears Work  

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Transcription:  




The ears collect sounds and turn them
into messages for the brain to interpret. They also send information about
balance to the brain. 
 



Three sections of the ear work together
to make this happen: they are the outer ear, the middle ear, and the inner
ear. 
 



The outer ear is made up of the pinna
and the ear canal. 
 



These parts gather sounds from the
environment and funnel them into the middle ear. 
 



The middle ear takes these sounds and
turns them into vibrations. 
 



Sounds that come into the middle ear hit
the eardrum, causing it to move. The Eustachian tube helps the eardrum to work
well by keeping the air pressure balanced on both sides. 
 



When the eardrum moves, it makes three
small bones, called ossicles, vibrate. 
 



The vibrations are then sent to the
inner ear. 
 



The inner ear receives vibrations and
changes them into messages that go to the brain. These messages are called
nerve signals. 
 



The inner ear is made up the cochlea and
the vestibule, which includes the semicircular canals. 
 



The cochlea has fluid in it that moves
like a wave. This happens when vibrations come in from the middle ear. The
moving fluid causes hair cells to make nerve signals about sound. 
 



Semicircular canals also use moving
fluid to create nerve signals that help with balance. 
 



Then, the signals from the cochlea
travel along the auditory nerve. 
 



Signals from the semicircular canals go
along the vestibular nerve. 
 



These two nerves come together and lead
to the brain. 
 



There, the brain decodes the signals to
get information about sound and balance.
 



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Questions:

 



1. What do ears collect
and send to the brain? What are the three sections of the ear?
 



2. What are the parts
of the outer ear? What does the middle ear do with sound?
 



3. What does the
cochlea do with the vibrations? What helps the brain know about balance? What
two nerves carry signals to the brain?
 

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