Origin of Ulnar Nerve Ulnar nerve comes from the medial cord of the brachial plexus (C8-T1) Course of Ulnar Nerve Lies posteromedial to brachial artery in anterior compartment of upper 1/2 arm Pierces medial IM septa at the arcade of Struthers ~ 8cm from medial epicondyle and lies with triceps Travels on back of medial epicondyle; vulnerable in fractures login to view 4 more bullets Does send small sensory branch to elbow that can be sacrificed Passes into forearm between 2 heads of flexor carpi ulnaris Runs between FCU + FDP At the wrist, the ulnar nerve and artery pass superficial to the flexor retinaculum Motor Innervation of Ulnar Nerve motor login to view 13 more bullets sensory branches of ulnar nerve login to view 3 more bullets Clinical Conditions Cubital Tunnel Syndrome compression sites login to view 8 more bullets Ulnar tunnel syndrome: compression in Guyon’s Canal login to view 8 more bullets