2 Diagnostic Aud II - Source Of AEPs

Question 1

Differences between the afferent pathways and efferent pathways in terms of important structures:
Hint: final common pathway and IHCs vs OHCs

Answer 1

Afferent:
Efferent:

Question 2

Where is the first place that the information from one ear can be compared to the other ear?
Hint: What fibers travel through the trapezoid body?

Answer 2

The

Question 3

What is meant by parallel, bilateral, and divergent?

Answer 3

Parallel:
Bilateral:
Divergent:

Question 4

Describe where the auditory system is represented in the thalamus and how each of the 3 parts are relevant.

Answer 4

The

Question 5

Describe what decussation means and how it impacts the auditory nervous system.

Answer 5

The

Question 6

Describe where the primary auditory cortex is located.

Answer 6

The primary auditory cortex is located on the superior temporal gurus in the temporal lobe.
(It receives point-to-point input from the ventral division of the medial geniculate complex; thus it contains a precise tonotopic map)

Question 7

What is the relationship between ion concentrations in intracellular and extracellular fluids and why does it matter?

Answer 7

The relationship between ion concentrations

Question 8

What happens with depolarization and hyperpolarization of a neuron?

Answer 8

Depolarization:
Hyperpolarization:

Question 9

How is an action potential transmitted along a neuron and what role does myelin play in transmission?

Answer 9

Action potential is transmitted

Question 10

What are the pros and cons of using lesion studies in animals to determine source locations of AEPs?

Answer 10

Pros:
Cons:

Question 11

What are some of the challenges of interfering source locations based upon scalp recordings?

Answer 11

Challenges include

Question 12

How might a large vestibular schwannoma impact the ABR as well as other cranial nerve function?

Answer 12

A vestibular schwannoma