FSG 2

Question 1

Where is the organ of Corti?

Answer 1

inside the cochlear duct

Question 2

What does the organ of Corti consist of?

Answer 2

• hair cells
• support cells
• tectorial membrane
• terminals of cochlear nerve

Question 3

What are the hair cells embedded in?

Answer 3

tectorial membrane

Question 4

What splits the cochlea into upper and lower chambers?

Answer 4

basilar membrane

Question 5

function of hair cells

Answer 5

bend when vibrated to convert sounds to neural signals

Question 6

basilar membrane fibers:

Thin, attached ends vibrate at (high/low) frequencies

Answer 6

high

Question 7

basilar membrane fibers:

long, free ends vibrate at (high/low) frequencies

Answer 7

low

Question 8

What innervates the organ of corti?

Answer 8

terminals of cochlear branch of CN 8

Question 9

How is sound converted to neural signals? (step by step)

Answer 9

1. sound waves hit ear drum
2. ossicles vibrate at opening of upper chamber
3. cochlear fluid moves
4. basilar membrane vibrates
5. hair cells move
6. HAIR on the hair cells bend and get mechanical depolarization
7. info sent to brain via cochlear nerve endings

Question 10

Which parts of the brain receive auditory signals?

Answer 10

• primary auditory cortex
• secondary auditory cortex
• Wernicke’s area

Question 11

The sensory portions of cranial nerves are this type of neuron

Answer 11

pseudounipolar