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becomes mostly tendon early on. Passing between the brachioradialis and the extensor carpi radialis brevis, this tendon continues into the second tendon compartment together with the latter muscle.

It is inserted into the dorsal surface of the base of the metacarpal of the index finger (second metacarpal).

Innervation

The extensor carpi radialis longus is a wrist extensor that is innervated by the radial nerve,

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