Sound and balance physiology Flashcards

1
Q

Movement of the tympanic membrane causes…

A

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

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2
Q

Movement of stapes at the oval window causes…

A

pressure waves to be established in the perilymph of the cochlea

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3
Q

Pressure waves within the perilymph travel to…

A

the round window

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4
Q

How is information about frequency gained?

A

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

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5
Q

How is information on the intensity of sound gained?

A

Number of hair cells which depolarise

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6
Q

Vibration of the basilar membrane causes…

A

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

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7
Q

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

A

Via the cochlear branch of CN VIII.

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8
Q

Where do sensory neurones from the cochlea synapse?

A

Cochlear nucleus

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9
Q

From the cochlear nucleus, where does sound information go?

A

Superior olivary nucleus of the pons

Inferior colliculus of the midbrain

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10
Q

Function of the superior olivary nucleus

A

localization of sound

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11
Q

Function of the inferior colliculus

A

direct a variety of unconscious motor responses to sound

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12
Q

Where in the thalamus does ascending sensory information synapse?

A

Medial geniculate nucleus

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13
Q

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

A

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

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