Questions: After axotomy, the degeneration of the proximal segment is referred to as " degeneration." A. anterograde B. retrograde C. distal D. transneuronal

After axotomy, the degeneration of the proximal segment is referred to as " degeneration." A. anterograde B. retrograde C. distal D. transneuronal
Transcript text: After axotomy, the degeneration of the proximal segment is referred to as "$\qquad$ degeneration." A. anterograde B. retrograde C. distal D. transneuronal
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Solution

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The answer is the second one (B): retrograde degeneration.

Explanation for each option:

A. Anterograde degeneration: This refers to the degeneration of the distal segment of a neuron after axotomy, which is the part of the axon that is disconnected from the cell body. Therefore, this is incorrect for the proximal segment.

B. Retrograde degeneration: This refers to the degeneration of the proximal segment of a neuron after axotomy, which is the part of the axon still connected to the cell body. This is the correct answer.

C. Distal degeneration: This term is not typically used in the context of axotomy. It might be confused with anterograde degeneration, which affects the distal segment, but it is not the correct term for the proximal segment.

D. Transneuronal degeneration: This refers to the degeneration of neurons that are connected to the injured neuron, either upstream or downstream, and is not specific to the proximal segment after axotomy.

In summary, after axotomy, the degeneration of the proximal segment is referred to as retrograde degeneration.

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