FSG 2 Flashcards
1
Q
Where is the organ of Corti?
A
inside the cochlear duct
2
Q
What does the organ of Corti consist of?
A
- hair cells
- support cells
- tectorial membrane
- terminals of cochlear nerve
3
Q
What are the hair cells embedded in?
A
tectorial membrane
4
Q
What splits the cochlea into upper and lower chambers?
A
basilar membrane
5
Q
function of hair cells
A
bend when vibrated to convert sounds to neural signals
6
Q
basilar membrane fibers:
Thin, attached ends vibrate at (high/low) frequencies
A
high
7
Q
basilar membrane fibers:
long, free ends vibrate at (high/low) frequencies
A
low
8
Q
What innervates the organ of corti?
A
terminals of cochlear branch of CN 8
9
Q
How is sound converted to neural signals? (step by step)
A
- sound waves hit ear drum
- ossicles vibrate at opening of upper chamber
- cochlear fluid moves
- basilar membrane vibrates
- hair cells move
- HAIR on the hair cells bend and get mechanical depolarization
- info sent to brain via cochlear nerve endings
10
Q
Which parts of the brain receive auditory signals?
A
- primary auditory cortex
- secondary auditory cortex
- Wernicke’s area
11
Q
The sensory portions of cranial nerves are this type of neuron
A
pseudounipolar
