| Sunderlanda | Seddonb | Structure injured | Prognosis |
|---|---|---|---|
| First degree | Neurapraxia | Schwann cell (demyelination) | Complete recovery within 12 wk |
| Second degree | Axonotmesis | Axon (wallerian degeneration) | Complete recovery regeneration 1 mm/day |
| Third degree | Endoneurium | Incomplete recovery | |
| Fourth degree | Perineurium | No recovery | |
| Fifth degree | Neurotmesis | Epineurium | No recovery |
| Sixth degree | Mixed injury, neuroma, incontinuity | Unpredictable recovery |
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