W22-L5: Hearing Flashcards Preview

Matt's Block 06 - Neuro block > W22-L5: Hearing > Flashcards

Flashcards in W22-L5: Hearing Deck (20):
1

What is the function of the ossicles?

Matches the impedance of the air to impedance of the fluid within the inner ear

2

What are the three chambers of the cochlea?

Scala vestibuli
Scala media
Scala tympani

3

The basilar membrane is wider at the

Apex

4

The basilar membrane is stiffer at the

Base

5

The base responds to which frequencies?

High

6

What is the organ of corti?

Auditory receptors and hair cells sandwiched between basilar membrane and reticular lamina

7

Deflection of the hair bundle towards tallest stereocilium causes

opening of channels, and depolarization

8

Displacement of the hair bundle in either directions alters what?

membrane potential

9

T/F The change in membrane potential due to displacement is symmetric

False, Larger depolarizations than hyperpolarization

10

Why is potassium important in hearing?

Potassium serves to both depolarize and repolarize the cell

11

The endolymph has high or low potassium?

High

12

What are the two types of hair cells and where do they project to?

Inner hair cells:
95% of nerves that project
to brainstem nuclei

Outer hair cells:
Efferent inputs from the superior olivary complex

13

What can outer hair cells do during low intensity stimuli to amplify signal?

Change length, Depolarization causes cell contraction
Hyperpolarization causes cell elongation

14

How do antibiotics cause hearing loss?

Loss of outer hair cells, reduces basilar membrane movement

15

What is the auditory pathway to the cortex?

Cochlear nucleus, lateral lemniscus, inferior colliculus, MGN, cortex

16

What is the superior olivary complex?

Lateral and medial superior olives & the
trapezoid body

17

What does the medial superior olive do?

Localization of sound by measuring time delay

18

What does the lateral superior olive do?

localization of sound by sensing intensity differences

19

When is the duplex theory relevant?

Low frequencies

20

When is Interaural intensity difference important?

High frequencies

Decks in Matt's Block 06 - Neuro block Class (48):