1 - Anatomy & Physiology of the Auditory Nervous System

Question 0

Afferent Fibers

Answer 0

Go from the inner ear to the nervous system

Question 1

Cochlea is innervated by both ________ and ________.

Answer 1

Afferent Fibers

Efferent Fibers

Question 2

Efferent Fibers

Answer 2

Go from the nervous system the the inner ear

Question 3

What are the two types of afferent fibers?

Answer 3

Type I

Type II

Question 4

Do afferent fibers have a myelin sheath?

Answer 4

No, not within the organ of corti

Question 5

How are afferent fibers arranged?

Answer 5

Tonotopically

The lower frequencies are in the middle of the bundle, the higher frequencies are on the outside

Question 6

What are Type I fibers also called?

Answer 6

Radial Fibers

Question 7

What percentage of afferent fibers are Radial/Type I Fibers?

Answer 7

85%

Question 8

How many hair cells do Type I/Radial Fibers connect to?

Answer 8

Only 1 or 2

Question 9

How many Radial/Type I fibers innervate each inner hair cell?

Answer 9

Up to 20

Question 10

What are Type II Fibers also called?

Answer 10

Outer Spiral Fibers

Question 11

Which row of outer hair cells do Type II/Outer Spiral Fibers innervate?

Answer 11

The first row

Question 12

How many outer hair cells do each Type II/Outer Spiral Fiber innervate?

Answer 12

A whole lot

Question 13

Where do afferent fibers leave the cochlea?

Answer 13

Habenula Perforata

Question 14

Which cranial nerve carries information from both the hearing and balance systems?

Answer 14

The VIIIth Cranial Nerve

Question 15

Where is the habenula perforata located?

Answer 15

It is a small opening in the spiral laminia

Question 16

When do the auditory nerves become mylenated?

Answer 16

Once they pass through the habenula perforata

Question 17

Where is the first synapse for all auditory nerve fibers?

Answer 17

The Cochlear Nucleus

Question 18

How is the cochlear nucleus arranged?

Answer 18

Tonotopically

Question 19

Where do the auditory nerves synapse after the cochlear nucleus?

Answer 19

The olivary complex

Question 20

The olivary complex is the first point in the nervous system where ________.

Answer 20

The two ears communicated with each other

Question 21

What does the olivary complex allow for?

Answer 21

Sound Localization

Figure-Ground Separation

Question 22

Binaural

Answer 22

Both ears

Question 23

Figure-Ground Separation

Answer 23

Separating the signal from noise

Question 24

Where does the inferior colliculus receive input?

Answer 24

From both the cochlear nucleus and the olivary complex

Question 25

What might the olivary complex be the source for?

Answer 25

Central auditory processing deficits

Question 26

When nerves leave the superior olive, where do they synapse next?

Answer 26

Lateral Lemniscus

Question 27

Lemniscus

Answer 27

Ribbon

Question 28

When nerves leave the lateral lemniscus, where do they synapse next?

Answer 28

Medial Geniculate

Question 29

Geniculate

Answer 29

Knee-shaped

Question 30

When nerves leave the medial geniculate, where do they next synapse?

(5)

Answer 30

Appropriate cortex areas

Herschel’s Area

Wernicke’s Area

Cerebellum

Reticular Formation

Question 31

What does the reticular formation deal with?

Answer 31

Arousal