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Flashcards in Efferent System Deck (12):
1

What are the two main divisions of the efferent system? Which one do we know more about?

-Caudal --> know more about
-Rostral

2

What are the 3 main feedback loops in the rostral portion? Which is the main auditory
processing loop?

-AC --> IC --> vMGB (main auditory processing loop)
-AC --> IC --> PTG
-AC --> SC --> MGB

3

The neurons in the LOCB originate from where? Do they mostly have crossed or uncrossed
projections?

-LSO
-Uncrossed projections to the PVCN

4

The neurons in the MOCB originate from where? Do they mostly have crossed or uncrossed
projections?

-MNTB, VNTB, DMPO, VMPO
-Crossed projections

5

Describe the connections of MOCB fibers to IHCs and OHCs.

-IHCs: indirect
-OHCs: direct

6

How do rate-intensity functions change with background noise? Noise + MOCB?

-Noise: suppression, increase in neural threshold for CF
-Noise+MOCB: increasing neural firing at high levels to try to overcome noise/return back to sharp/normal tuning and rate-level function

7

What is the average change in threshold for an ANF with MOCB stimulation?

-15 dB reduction

8

How does the cochlear microphonic change with MOCB stimulation?

-Enhanced

9

How does the compound action potential change with MOCB stimulation?

-Suppressed

10

How does the summating potential change with MOCB stimulation?

-Suppressed

11

How does the endocochlear potential change with MOCB stimulation?

-6-7% reduction

12

How does MOCB stimulation change hair cell polarization?

-Hyperpolarization