The nerve to the lateral head of triceps arises from the radial nerve in the spiral groove, making it vulnerable to Saturday night palsy and humeral shaft fracture-related radial nerve injuries. Its denervation alongside wrist drop confirms a spiral groove-level radial nerve lesion.
Denervation of the lateral head of triceps alongside wrist drop confirms the radial nerve injury is at or proximal to the spiral groove but spares the long head branch. The lateral head is a reliable EMG target for localising radial nerve injuries in the mid-humerus. Recovery of lateral head triceps after spiral groove palsy typically follows recovery of brachioradialis.
Lateral head triceps and wrist extensor denervation from mid-humeral radial nerve compression (Saturday night palsy, humeral fracture) producing wrist and finger drop with preserved long head triceps, expected to recover within 3-4 months without surgery.
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