Brachioradialis is the most lateral elbow flexor with a radial nerve supply making it the key localising muscle for radial nerve injuries and the classic tendon for radial nerve palsy tendon transfer.
| Origin | Lateral supracondylar ridge of the humerus — proximal two-thirds |
|---|---|
| Insertion | Styloid process of the radius |
| Nerve Supply | Radial nerve (C5, C6) — before the lateral epicondyle |
| Blood Supply | Radial artery |
| Actions | Flexes the elbow — most effective at 90 degrees; Brings the forearm to neutral rotation |
|---|
Preserved BR with absent wrist extensors localises the lesion to the PIN. BR is harvested for tendon transfer to restore finger extension. It is the dominant flexor during power gripping.
Palpable on the lateral forearm during resisted elbow flexion in neutral rotation.
BR to ECRB transfer restoring wrist extension using the proximally-arising radial nerve supply.
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