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Sunderland classification.
| Sunderland class | Injury | Recovery |
|---|---|---|
| I | Neuropraxia: localized and reversible conduction blockade | Complete |
| II | Axonotmesis: axonal disruption | Complete |
| III | Endoneurium: axonal and endoneurial sheath disruption | Wallerian degeneration, incomplete |
| IV | Perineurium: axonal, endoneurial sheath and perineurial sheath | Wallerian degeneration, incomplete |
| V | Neurotmesis: axonal, endoneurial sheath, perineurial sheath, and epineurial sheath | Wallerian degeneration, incomplete |
