Axilla: Saturday night palsy or using crutches- Loss of extension at elbow, wrist, and MP joints- Weakened supination- Sensory loss on posterior arm, forearm, and dorsum of thumb- "Wrist drop"

Mid-shaft of humerus at radial groove or lateral elbow (lateral epicondyle or radial head dislocation:- Loss of forearm extensors of the wrist and MP joints- Weakened supination- Sensory loss on the posterior forearm and dorsum of thumb- "Wrist drop"Lesions of radial nerve distal to axilla, elbow extension is spared.

Wrist: laceration- No motor loss- Sensory loss only on dorsal aspect of thumb (first dorsal web space)