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Laboratory 7. Flexor Region of the Forearm
Step 3. Radial Nerve and its Branches in the Cubital Fossa

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Deep to the brachioradialis muscle on the lateral side of the biceps brachii tendon , identify the deep branch of the radial nerve and the superficial branch of the radial nerve. The superficial branch of the radial nerve supplies cutaneous sensation to the dorsal surface on the radial side of the hand. The deep branch of the radial nerve innervates the supinator muscle and the extensor muscles of the posterior compartment of the forearm.

Links and References:
Grant's: 6.59-6.63
Netter (1ed.): 408 and 420-422 (2ed.): 404 and 416-418
Rohen/Yokochi: 393-397