Extensor carpi radialis brevis muscle

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The extensor carpi radialis brevis 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 brevis longus muscle works in conjunction with the extensor carpi radialis longus muscle, a longer and thinner muscle located above it.

Contents

Origin

The extensor carpi radialis brevis muscle originates from the humerus, on the anterior aspect of the lateral epicondyle.

Insertion

The extensor carpi radialis brevis muscle inserts at the posterior base of the third metacarpal bone, the metacarpal bone of the middle finger.

Innervation

The extensor carpi radialis brevis muscle is innervated by the posterior interosseous nerve, C7 and C8.

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