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Cross-sectional views of the ulnar nerve (UN) at the wrist (a), forearm (b), cubital tunnel (d), and epicondylar groove (d). UA: ulnar artery, P: pisiform bone, FDS: flexor digitorum superficialis muscle, FCU: flexor carpi ulnaris muscle, FDP: flexor digitorum profundus muscle. Demonstration of patient positioning for evaluation of the ulnar nerve at the elbow (e).
