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Extensor carpi radialis longus muscle

Synonym: long radial hand extensor
German: Musculus extensor carpi radialis longus

1 Definition

The extensor carpi radialis longus muscle belongs to the radial group of the forearm extensors.

2 Devolution

The muscle has its origin at the lateral supracondylar crest at the lower third of the humerus, as well as at the lateral intermuscular septum of the arm. Upwards, the muscle is partly covered by the brachioradialis muscle. The extensor carpi radialis longus muscle is narrowing in the lower third of the forearm into a flat tendon which draws into distal direction closely together with the tendon of the extensor carpi radialis brevis muscle. It follows the lateral side of the radius, passes below the abductor pollicis longus muscle and the extensor pollicis brevis muscle to the wrist, and passes the 2nd tendon compartment of the extensor retinaculum in its course.

The tendineous insertion of the extensor carpi radialis longus muscle is the dorsal base of the 2nd metacarpal bone.

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3 Innervation

The innervation of the extensor carpi radialis longus is provided by the radial nerve from the brachial plexus (segments: C6-C7).

4 Function

The extensor carpi radialis longus muscle effects flexion in the elbow joint, extension of the hand in the wrist (dorsal flexion), as well as a slight abduction of the hand in direction of the radius.

Specialties: Anatomy

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