The ulnar, medial and radial nerves can be anesthetized at the level of the epicondyles. The ulnar nerve (figure 37a) is palpated and anesthetized behind the medial epicondyle. The radial nerve (figure 37b) pierces the lateral intermuscular septum through the origin of the brachialis muscle, it then lies under the medial border of brachioradialis, and gives off its posterior interosseous branch. Both nerves are anesthetized by passing the needle deep to the medial border of the brachioradialis at the epicondylar level, and backwards towards the capitulum of the humerus. The musculocutaneous nerve also passes superficially at this site. The median nerve lies medial to the palpable brachial artery. Anesthetic placed superficial to the artery also anesthetises the anterior branch of the medial cutaneous nerve of the forearm and terminal branches of the medial nerve of the arm