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spinal cord lesion
LMN or UMN?
| Symptom | LMN or UMN |
|---|---|
| lost voluntary control | both LMN and UMN |
| spastic, increased mm tone | UMN |
| flaccid, decreased mm tone | LMN |
| reflex arc absent | LMN |
| reflex arc present | UMN |
| absent pathologic reflexes | LMN |
| little or no mm atrophy | UMN |
| significant mm atrophy | LMN |
| present pathologic reflexes | UMN |