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Superficial Muscles, Tendons, Nerves, and Vessels of the Posterior Forearm and Dorsum of Hand Margene Fallon Superficial Muscle Group 3 Lateral Muscles • • • Brachioradialis (Flexes elbow) Extensor carpi radialis longus (extends wrist; aids in radial flexion of wrist) O: lateral supracondylar ridge of humerus I: metacarpal II N: Radial nerve Extensor carpi radialis brevis (extends wrist; aids in radial flexion of wrist) O: Lateral epicondyle of humerus I: metacarpal III N: Posterior interosseous nerve Superficial Muscle Group 4 Posterior Muscles Originate at Lateral epicondyle of humerus • Anconeus (Extends elbow) I: Olecranon & posterior surface of ulna N: radial nerve • Extensor digitorum I: Dorsal surfaces of phalanges 2-5 N: posterior interosseous nerve • Extensor digiti minimi I: proximal phalanx 5 N: Posterior interosseous nerve • Extensor carpi ulnaris • • I: base of metacarpal 5 N: posterior interosseous nerve Watch Out • Do not sever: 1. Posterior antebrachial cutaneous nerve 2. Extensor retinaculum Posterior antebrachial cutaneous nerve