First change to occur after nerve cut is_______________?
Correct answer: D. Myelin sheath degeneration
- A. Schwan cell mitosis
- B. Axonal sprouting
- C. Nuclear disintegration
- D. Myelin sheath degeneration
Explanation
After a nerve is cut, the distal axon and its myelin undergo Wallerian degeneration, with myelin breakdown occurring before Schwann-cell proliferation and axonal sprouting. Nuclear disintegration is not the defining early event in the injured nerve fibre.
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