Sound and balance physiology Flashcards Preview

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Flashcards in Sound and balance physiology Deck (13):
1

Movement of the tympanic membrane causes...

Movement of the auditory ossicles against the oval window of the cochlea

2

Movement of stapes at the oval window causes...

pressure waves to be established in the perilymph of the cochlea

3

Pressure waves within the perilymph travel to...

the round window

4

How is information about frequency gained?

Sounds of different frequencies maximally distort the basilar membrane at different points- this allows information about sound to be converted to information about position

5

How is information on the intensity of sound gained?

Number of hair cells which depolarise

6

Vibration of the basilar membrane causes...

Hair cells to vibrate against the tectorial membrane, causing depolarization of hair cells

7

How is information about frequency and intensity of sound conveyed to the CNS?

Via the cochlear branch of CN VIII.

8

Where do sensory neurones from the cochlea synapse?

Cochlear nucleus

9

From the cochlear nucleus, where does sound information go?

Superior olivary nucleus of the pons
Inferior colliculus of the midbrain

10

Function of the superior olivary nucleus

localization of sound

11

Function of the inferior colliculus

direct a variety of unconscious motor responses to sound

12

Where in the thalamus does ascending sensory information synapse?

Medial geniculate nucleus

13

In what sense is the primary auditory cortex a "map" of the Organ of Corti?

Information about high-frequency and low-frequency sounds are delivered to particular segments of the cortex