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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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Identify the deep branch of the radial nerve [probe] and follow its course as it pierces the supinator muscle and passes into the extensor compartment of the posterior forearm [probe pierces the supinator muscle and retractor holds the extensor digitorum muscle] [retractor holds the extensor digitorum muscle and tip of the probe pierces the supinator muscle]. As the deep branch of the radial nerve passes into the posterior compartment, it is called the posterior interosseous nerve [some of these branches are held by the probe].

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