Cochlear Nucleus Flashcards

1
Q

How many sections does the CN have? What are they?

A

The cochlear nucleus has three sections: anteroventral cochlear nucleus (CAN), posteroventral cochlear nucleus (PVCN), and the dorsal cochlear nucleus (DCN).

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2
Q

How is the CN tonotopically organized?

A

The low-frequency AN fibers project to the lateral regions of the CN, and the high frequencies to the medial regions of the DCN and PVCN.

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3
Q

What are the 5 main cell types in the CN?

A

The five main cell types in the cochlear nucleus are the pyramidal, spherical bushy, globular bushy, multipolar, and octopus.

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4
Q

What are the 5 main PSTH types in the CN?

A

The five main PSTH types are the primary like, on, chopper, primary with notch, and pauser.

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5
Q

Compared to the AN, the CN has this type of phase locking.

A

The CN has enhanced phase locking.

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6
Q

Where are the spherical and globular bushy cells? Where do they project? They effectively act as what?

A

The spherical and globular bushy cells are located in the anteroventral cochlear nucleus (AVCN). The cells project to the ventral acoustic stria. They effectively act as a relay station because they have primary like responses.

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7
Q

Inhibition changes PSTHs. It also changes rate-level functions. What is one change that can occur for a rate-level function when there is inhibition as compared to when there is none?

A

Increasing amounts of inhibition at high levels creates non-monotonic rate-intensity functions. Now the cells have a characteristic intensity as well as frequency.

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8
Q

Which area has the best temporal processing in the CN? Spectral processing?

A

The AVCN, with the bushy and octopus cells, is best at temporal coding. The DCN is best at spectral processing.

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9
Q

What is the largest outflow from the CN?

A

The largest outflow is from the AVCN to the ventral acoustic stria or trapezoid body.

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