In neurapraxia, which statement is true?

• A. There is axonal disruption
• B. There is conduction block with intact axon
• C. There is complete nerve transection
• D. Wallerian degeneration is initiated

Answer: (B)

Neurapraxia is the mildest nerve injury in the Seddon classification, and its hallmark is a temporary conduction block with preserved axons. The myelin sheath is briefly disrupted at the site, which blocks impulse transmission locally, but the axon itself remains intact. Because the axon is not damaged, there is no Wallerian degeneration distal to the lesion, and recovery occurs as remyelination and restoration of conduction over days to weeks. This is why the statement that describes conduction block with an intact axon is correct. If the axon were disrupted, you’d be dealing with axonotmesis or neurotmesis, where Wallerian degeneration would occur and recovery would depend on axonal regeneration.