exam 1 Flashcards
1
Q
Divisions of the auditory system
A
- Outer ear
- Middle ear
- Inner ear
- Auditory nerve (8th)
- Central auditory nervous system
2
Q
Structures part of the outer ear
A
Pinna & ear canal
3
Q
Functions of the outer ear
A
Funnels sound, protects ear
4
Q
Important notes about outer ear
A
- Transfer function up to 15-20 dB
- Acoustic vibration
5
Q
Middle ear functions
A
- Acoustic energy to mechanical energy
- Impedence matching: 33 dB increase in middle ear
- Acoustic reflex: bilateral response- loud tone in one ear can be heard in both
6
Q
Eustachian tube states
A
adult: 45 degrees
child: 180 degrees: the fluid is more hard to drain, more ear infections
normal state: closed
7
Q
Eustachian tube function
A
equalize pressure
8
Q
Cone of light
A
light on the right means right ear
9
Q
What color ear is red
A
Right
10
Q
What color ear is blue
A
Left
11
Q
Cochlea note
A
High frequencies at the base, low frequencies at the apex
12
Q
Cochlea functions
A
- Sheering of hair cells
- Depolarization
- Mechanical energy to hydromechanical
- Movement of basilar membrane
- Tonotopic organization
13
Q
Inner hair cells
A
- Passive process of the cochlea
- 1 row
- 3500 in a single row
14
Q
Outer hair cells
A
- Active process of the cochlea
- 3 rows
- W shaped
- Embedded in the tectorial membrane
15
Q
Wavelength
A
speed of sound/frequency
