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1 In two layers: a superficial layer a deep layer. 2 Brachioradialis Extensor carpi radialis longus Extensor carpi radialis brevis Extensor carpi ulnaris Extensor digitorum Extensor digiti minimi Anconeus Common origin lateral epicondyle of the humerus Except for the brachioradialis and anconeus, extend as tendons into the hand. Lateral epicondyle Lateral of humerus epicondyle of Proximal part of humerus supraepicondylar ridge of Distal part of supraepicondylar Lateral epicondyle of Lateral Lateral epicondyle epicondyle of of humerus ridge of humerus humerus humerus humerus commonextensor extensororigin origin Extensor common expansion Olecranon and proximal (hood) of posterior surface of ulna dorsal aspects of the the 5th digit bases of the middle and distal phalanges of Lateral surface distal the medial four of digits Base of end of radius proximal Base Base of3rd 5th of 2nd th metacarpal Base Base 2nd the metacarpal 5metacarpal Base ofofof 3rd metacarpal to styloid process metacarpal metacarpals 3 Supinator Abductor pollicis longus Extensor pollicis longus Extensor pollicis brevis Extensor indicis Posterior surface of middle third of ulna and interosseous membrane Dorsal surface of base of distal phalanx of thumb Posterior surface of distal third of radius and interosseous membrane Dorsal surface of base of proximal phalanx of the thumb Posterior of Superficial (humeroulnar) Posterior surfacesurface ofhead proximal distal 1/3 of •lateral epicondyle of ulna halves of ulna, radius, and and interosseous humerus interosseousmembrane membrane •radial collateral and anular ligaments Deep (ulnar) head Supinator crest of the ulna Base of 1st metacarpal Lateral surface of radius Extensor superior to the anterior oblique line expansion (hood) of 2nd digit Except for the supinator muscle, all these deep layer muscles originate from the posterior surfaces of the radius, ulna, and interosseous membrane and pass into 4 the thumb and fingers. 5 Brachioradialis Extensor carpi radialis longus Radial nerve (Main nerve) Supinator Extensor carpi radialis brevis Deep branch of radial nerve Rest Posterior interosseous nerve continuation of deep branch of radial nerve 6 Radial artery Posterior interosseous artery origin: common interosseous branch of the ulnar artery recurrent interosseous artery End by joining to dorsal carpal arch of the wrist Anterior interosseous artery origin: common interosseous branch of the ulnar artery 7 Deep branch becomes posterior interosseous nerve after emerging from between 2 heads of supinator Posterior interosseous nerve passes deep to extensor pollicis longus to reach the wrist. 8