Extensor carpi radialis brevis (left) (Musculus extensor carpi radialis brevis)
Educational content only — not medical advice.
Anatomy
Lies under the longus and arises from the lateral epicondyle itself via the common extensor tendon — the tendon targeted in clinical tennis elbow — reaching the third metacarpal base.
Origin & insertion
Lateral epicondyle of the humerus via the common extensor tendon.
Action
Extends and stabilises the wrist with slight radial deviation.
Innervation
Radial nerve — deep branch before the radial tunnel (C7–C8).
Clinical notes
Tennis elbow is mechanical insertional tendinopathy of its origin, not systemic inflammation — load modification first; the radial deep branch passes beneath its proximal edge where radial-tunnel entrapment occurs.
Related structures
Educational references
FAQ
What is the role of the Extensor carpi radialis brevis (left)?
Lies under the longus and arises from the lateral epicondyle itself via the common extensor tendon — the tendon targeted in clinical tennis elbow — reaching the third metacarpal base.
Why is the Extensor carpi radialis brevis (left) clinically important?
Tennis elbow is mechanical insertional tendinopathy of its origin, not systemic inflammation — load modification first; the radial deep branch passes beneath its proximal edge where radial-tunnel entrapment occurs.
Source & license
BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/). license details