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The Ear
- Outer ear
- Pinna - visible part of the ear,
funnels sound intot he ear canal,
made of cartilage
- Ear canal - leads
to the ear drum
- Ear drum - membrane of
skin, vibrates when sound
hits it
- Pinna - visible part of the ear,
funnels sound intot he ear canal,
made of cartilage
- Middle ear
- Ossicles (Hammer - mallus,
Anvil - incus, Stirrup -
stapes
- Eustachian tube - keeps
pressure equal on both sides
of ear drum
- Ossicles (Hammer - mallus,
Anvil - incus, Stirrup -
stapes
- Inner ear
- Cochlea - fluid filled, coiled,
helps with hearing
- Semi-circular canals - helps
with balance
- Cochlea - fluid filled, coiled,
helps with hearing
- We hear by...
- The pinna channeling the sound to the eardrum
- The eardrum vibrates, which then causes the ossicles
to vibrate, which amplify the sound by 20 times
- The stirrup pushes on the oval window against the
cochlea, which moves the lymph inside
- Special hairs, which are nerve endings, sense the movement
and send messages to the brain along the auditory nerve
- The brain interprets these messages as sound
- We hear.
- We hear.
- The brain interprets these messages as sound
- Special hairs, which are nerve endings, sense the movement
and send messages to the brain along the auditory nerve
- The stirrup pushes on the oval window against the
cochlea, which moves the lymph inside
- The eardrum vibrates, which then causes the ossicles
to vibrate, which amplify the sound by 20 times
- The pinna channeling the sound to the eardrum
- We have 3 semi-circular canals so we can have
balance in 3 planes
- Deafness can be caused by long exposure
to high levels of noise, explosions, born
with a problem with the cochlea, drugs or
ear infections
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