ABSTRACT
During its course down the arm, the ulnar nerve lies in a sulcus on the posterior surface of the medial humeral epicondyle. Compression of the ulnar nerve in this area presents with symptoms characteristic of the syndrome of the ulnar nerve sulcus, or cubital tunnel syndrome. Ulnar nerve compression at the elbow is commonly accepted as the second most frequently encountered nerve entrapment in the upper extremity, exceeded in prevalence only by carpal tunnel syndrome.
