Anatomy of the Nerves, Arteries and Veins of the Arm (Upper Extremity). Labels include cephalic vein, brachial artery/vein, basilic vein, musculoskeletal nerve, ulnar collateral artery, radial collateral artery, ulnar nerve/artery/vein, interosseous artery/vein, median nerve and radial nerve/artery/vein.
Sometimes wrist and hand pain come from thoracic outlet syndrome. We can test for it with a nerve tension test (shown in this graphic). If you want to learn how to evaluate the nerves, this DVD Nerve Mobilization teaches that. http://www.realbodywork.com/nerve/nerve.htm
median nerve in the forearm, distal to the elbow joint, branches to the muscles in the superficial and intermediate layers of the forearm. Anterior interosseous nerve innervates the muscles in the deep layer. Palmar branch innervates the skin over the base and central palm. Injury of median nerve leads to Ape Hand/Thumb Deformity.