MPAS 523 Ear Disorders

MPAS 523 Ear
Disorders
1. What are the travel through the ear?
three parts of
the ear?


2. The number of
wave peaks that
pass a given
point in a
certain amount
of time
-Dictates tone

3. Height of a
wave
-Dictates volume

4. What does
shorter
wavelength
mean in terms
of frequen- cy
and pitch?

5. Sound
intensity
measured in
deci- bels (db)

6. What decibel can
cause hearing
loss?

7. How does a
sound wave
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, MPAS 523 Ear
Disorders
-Outer cy
-Middle
-

I

n
Amplitude
n

e
Shorter wavelength = higher frequency = higher pitch
r



F Acoustics

r

e Above 85
-Hearing damage with accumulated exposure over time
q

u -Sound wave becomes a pressure wave as it strikes the tympanic
membrane and is transmitted to the ossicles
e -Ossicles act as a single lever (malleus, incus, stapes)
-Faceplate of stapes on oval window pushes/pulls fluid inside cochlea
n -Pressure waves thru fluid become a nerve signal

8. Organ of Corti




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, MPAS 523 Ear
Disorders
Receptor organ
for hearing
- Lies on
basilar
membrane
- Contains hair
cells
- Cilia on hair
cells embed in
tectorial -Low frequency sensing hair cells are at apex (interior) of cochlea
membrane

9. What is the loca-
tion of low and high - High frequency sensing hair cells are at base (periphery) of
cochlea
frequency sensing
hair cells in the
cochlea?

10. Sensory hearing loss with age
- Damage of
12. the high frequen- cy sensing hair cells at the
base of the cochlea
- Lose high frequen- cy sounds first

What muscles con- tract in order to avoid
damage to the inner ear when exposed to
loud sounds?

11.




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, MPAS 523 Ear
Disorders
Pr ssicle system more rigid
es -Weakens fluid wave to
b decrease volume
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