Muscle | Origin | Insertion | Blood supply | Innervation |
Brachioradialis | Proximal 2/3 of lateral supracondylar ridge of humerus | Distal end of radius proximal to styloid process | Br from radial, radial collateral, and radial recurrent | Radial n
C5,6 |
Extensor Carpi Radialis Longus | Distal 1/3 of supracondylar ridge of humerus | Radial side of dorsal surface base of 2nd metacarpal | Same as brachioradialis | Radial n
C6,C7 |
Extensor Carpi Radialis Brevis | Lateral humeral epicondyle via common extensor tendon | Radial side, dorsal surface of base of 3rd & adjacent 2nd metacarpals | Same as brachioradialis | Posterior interosseous n
C7,8 |
Extensor Digitorum | Lat humeral epicondyle via CET | Dorsal surface of base of distal & middle phalanges | Br from radial recurrent & post interosseous a;
Perf br of ant interosseous a | Posterior interosseous n
C7,8 |
Extensor Digiti Minimi | Lat humeral epicondyle via CET | Dorsal digital expansion of 5th digit | Br from radial recurrent & post interosseous;
Terminal br of ant interosseous | Posterior interosseous n
C7,8 |
Extensor Carpi Ulnaris | Lat humeral epicondyle via CET
Posterior ulnar border | Tubercle on medial side of base of 5th metacarpal | Br from radial recurrent & post interosseous aa | Post interosseous n
C7,8 |
Anconeus | Post surface of lateral humeral epicondyle | Lateral aspect of olecranon;
Proximal 1/4 post ulna surface | Br from post interosseous a | Radial n
C6-C8 |
Supinator | Lateral humeral epicondyle;
Supinator crest of ulna and depression in front of it | Lateral surface of proximal 1/3 of radius | Br from radial recurrent, recurrent interosseous, and post interosseous aa | Deep br of radial n & post interosseous n C7,C8 |
Abductor Pollicis Longus | Posterior shaft of ulna distal to anconeus & adj interosseous mem;
Middle 1/3 of post surface of radius | Trapezium
Radial side of 1st metacarpal base | Lat br of post interosseous
Perf br of ant interosseous | Post interosseous n
C7,8 |
Extensor Pollicis Brevis | Medial part of middle 1/3 post surface of radius & adj interosseos mem | Bases of proximal and distal phalanges of thumb | Br of post interosseous a; perf br of ant interosseous | Post interosseous n
C7,8 |
Extensor Pollicis Longus | Lat part middle 1/3 post surface of shaft of ulnar & adj interosseous mem | Base of distal phalanx of thumb | Br of post interosseous; perf br of ant interosseous aa | Post interosseous n
C7,8 |
Extensor Indicis | Post surface of ulna, distal to extensor pollicis longus and adj interosseous mem | Ulnar side of tendon of extensor digitorum to index finger | Br of post interosseous a; perf br of ant inteosseous a | Post interosseous n
C7,8 |