Origin

Lateral supracondylar ridge

Insertion

2nd metacarpal

Action(s)

Extensor at the wrist joint, abducts the hand at the wrist

Nerve Supply

Being an extensor contained in the forearm, it is innervated by the radial nerve.

Arterial Supply

Radial artery

Physical Exam

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Clinical Importance

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Disease States

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Discussion

As the name suggests, this muscle is an extensor at the wrist joint, and travels along the radial side of the arm, so will also abduct the hand at the wrist. That is, it manipulates the wrist so as to move the hand towards the thumb (i.e., abduction—away from the midline of the body) and away from the palm (i.e., extension—increased angle between the palm and the front of the forearm).

The muscle, like all extensors of the forearm, can be strengthened by exercise that resist its extension. A wrist roller can be used and reverse wrist curls with dumbbells can performed.

Figures

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Credits:

From Wikipedia:
Extensor carpi radialis longus

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