| Brachial Plexus Lesion Proximal to dorsal root ganglion | |||
| 1 | Axon Reflexes remain intact | ||
| a | Triple flare 1% Histamine response preserved | ||
| b | Cold vasodilation (rewarming hyperemia) preserved | ||
| 2 | Sensory conduction normal despite anesthesia in the affected dermatome | ||