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Dorsal Forearm

Nerve, blood supply, origin, insertion

MuscleOriginInsertionBlood supplyInnervation
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
Created by: PippaODU
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