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Laboratory 9. Extensor Region of Forearm and Dorsum of Hand
Step 7. Supinator Muscle and Deep Branch of the Radial Nerve

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Now that the major branches of the radial nerve have been examined, identify the nerve branches to the extensor muscles.

Before dividing, the main trunk of the radial nerve gives branches to the brachioradialis muscle, extensor carpi radialis longus muscle, and anconeus muscle.

The deep branch of the radial nerve supplies the supinator muscle and the extensor carpi radialis brevis muscle.

The posterior interosseous nerve supplies all of the other muscles of the posterior compartment of the forearm.

Links and References:
Grant's: 6.83 and 6.116
Netter (1ed.): 451 and 453 (2ed.): 447 and 449
Rohen/Yokochi: 392, 397, and 398