Extensor carpi radialis longus muscle

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The extensor carpi radialis longus muscle is a muscle of the wrist that connects that humerus at the elbow to the hand. It acts to abduct and extend the hand.

The extensor carpi radialis longus muscle works in conjunction with the extensor carpi radialis brevis muscle, a shorter and thicker muscle that sits underneath it.

Contents

Origin

The extensor carpi radialis longus muscle originates from the humerus, on the lower third of the lateral supracondylar ridge.

Insertion

The extensor carpi radialis longus muscle inserts at the posterior base of the second metacarpal bone, the metacarpal bone of the index finger.

Innervation

The extensor carpi radialis longus muscle is innervated by the radial nerve, C6 and C7.

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