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The Extensor Carpi Radialis Longus is in the Superficial Layer of the Posterior Compartment of the forearm. It is also a member of the Wrist Extensor Group; the muscles of the wrist extensor group are:
- Lateral supracondylar ridge of the humerus to the radial side of the posterior hand.
- The proximal attachment is onto the distal 1/3 of the lateral supracondylar ridge.
- The distal attachment is onto the posterior side of the base of the second metacarpal.
- Extends the hand at the wrist joint.
- Radially deviates the hand at the wrist joint.
- Flexes the forearm at the elbow joint.
- The extensor carpi radialis longus is also a member of the Radial Group of forearm muscles (along with the brachioradialis and extensor carpi radialis brevis).
- The extensor carpi radialis longus crosses the elbow joint anteriorly so it flexes the elbow joint, but crosses the wrist joint posteriorly so it extends the wrist joint.