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11 Cards in this Set
- Front
- Back
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Brachioradialis
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Superficial layer
Origin: proximal 2/3 of supraepicondylar ridge of humerus Insertion: lateral surface of distal end of radius proximal to styloid process Innervation: radial nerve Function: relatively weak flexion of forearm. maximal when forearm is in mid pronated postition |
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Extensor carpi radialis longus (ECRL)
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Superficial Layer
Origin: lateral supraepicondylar ridge of humerus Insertion: dorsal aspect of base of 2nd metacarpal Innervation: radial nerve Function: extend and abduct hand at wrist. active during clenching |
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Extensor carpi radialis brevis (ECRB)
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Superficial Layer
Origin: lateral epicondyle of humerus Insertion: Dorsal aspect of base of 3rd metacarpal Innervation: deep branch of radial nerve Function: extend and abduct hand at the wrist joint, active during clenching |
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Extensor digitorum
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Superficial Layer
Origin: lateral epicondyle of humerus Insertion: extensor expansions of medial four digits Innervation: deep branch of radial nerve Function: extend medial 4 digits primarily oat mcp joints, secondarily at interphalan joints |
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Extensor digiti minimi (EDM)
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Superficial layer
Origin: lateral epicondyle of humerus Insertion: extensor expansion of 5th digit Innervation: deep branch of radial nerve Function: extends 5th digit primarily at mcp joint, secondarily at interphalan joint |
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Extensor carpi ulnaris (ECU)
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Superficial layer
Origin: lateral epicondyle of humerus. posterior border of ulna via aponeurosis Insertion: dorsal aspect of base of 5th metacarpal Innervation: deep branch of radial nerve Function: extends and adducts hand at wrist joint |
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Supinator
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Deep Layer
Origin: lateral epicondyle of humerus, radial collateral and anular ligaments, supinator fossa, crest of ulna Insertion: lateral, posterior, and anterior surfaces of proximal third of radius Innervation: deep branch of radial nerve Function: supinates forearm, roates radius to turn palm anteriorly or superiorly |
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Extensor indicis
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Deep layer
Origin: posterior surface of distal third of ulna and interosseous membrane Insertion: extensor expansion of 2nd digit Innervation: posterior interosseous nerve, continuation of deep branch of radial nerve Function: extends 2nd digit, helps extend hand at wrist |
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Abductor pollicis longus (APL)
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Outcropping of Deep layer
Origin: post surf of proximal 1/2s of ulna, radius, and interosseous membrane Insertion: base of 1st metacarpal Innervation: post interos nerve, deep branch of radial Function: abducts thumb and extends it at carpometacarpal joint |
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Extensor pollicis longus (EPL)
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Outcropping of Deep layer
Origin: post surf of middle 1/3 of ulna and interos mem Insertion: dorsal aspect of base of distal phalanx of thumb Innervation: post interos nerve, cont of deep radial Function: Extends distal phalanx of thumb at interphalan joint, extends metacarpophalan and carpometacarp joints |
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Extensor pollicis brevis (EPB)
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Outcropping of Deep Layer
Origin: Post surf of distal 1/3 of radius and interos mem Insertion: dorsal aspect of base of proximal phalanx of thumb Innervation: post interos nerv, cont of deep radial Function: extends proximal phalanx of thumb at metacarpophalan joint, extends carpometacarp joint |
