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Medsci-UpExt-Exam2

Muscles of the upper extremity

Muscle InnervationFunctionBlood supply
Biceps brachii musculocutaneous n. flexes arm at elbow joint; MAIN SUPINATOR OF FOREARM (when elbow flexed); weak flexor of shoulder joint (long head) brachial a.
Coracobrachialis musculocutaneous n. flexes arm (at elbow joint); weak adductor of arm brachial a.
Brachialis musculocutaneous n. MAIN FLEXOR OF FOREARM (when elbow flexed); supinates forearm brachial a.
Triceps brachii radial n. extends forearm at elbow (MAIN EXTENSOR OF ELBOW) profundi brachii a. (deep brachial a.)
Pronator Teres median n. pronates and flexes forearm "ulnar a., anterior ulnar recurrent a."
Flexor Carpi Radialis median n. flexes and aBducts hand at wrist ulnar a.
Flexor Carpi Ulnaris ulnar n. flexes and adducts hand at wrist muscular branches of ulnar a.
Palmaris Longus (often absent) median n. flexes hand at wrist; tightens palmar aponeurosis muscular branches of ulnar a.
Flexor Digitorum Superficialis median n. flexes middle phalanx of 2-5 fingers and hand; flexes MCP and wrist joints muscular branches of ulnar a.
Pronator Quadratus median n. primary mover to PRONATE FOREARM anterior interosseus a.
Flexor Pollicis Longus median n. flexes distal phalanx of thumb anterior interosseus a.
Flexor Digitorum Profundus medial half: ulnar n.; lateral half: median n. flexes distal phalanx of 2-5 fingers; flexes MCP and wrist joints muscular brances of ulnar a.; anterior interosseus a. (from ulnar a.)
Brachioradialis radial n. flexes forearm at elbow (only one in posterior) radial recurrent a.
Extensor Carpi Radialis Longus radial n. extends and aBducts hand at wrist radial a.
Extensor Carpi Radialis Brevis deep branch of radial n. extends and aBducts hand at wrist radial a.
Extensor Digitorum deep branch of radial n. extends fingers and hand interosseus recuurent a.
Extensor Digiti Minimi deep branch of radial n. extends MCP & IP joints of little finger interosseus recuurent a.
Extensor Carpi Ulnaris deep branch of radial n. extends and adducts hand at wrist ulnar a.
Anconeus radial n. extends elbow (along with triceps brachii m.) interosseus recuurent a.
ABductor Pollicis Longus deep branch of radial n. aBducts and extends thumb posterior interosseus a.
Extensor Pollicis Longus deep branch of radial n. extends distal phalanx of thumb posterior interosseus a.
Extensor Pollicis Brevis deep branch of radial n. extends MCP joint of thumb posterior interosseus a.
Extensor Indicis deep branch of radial n. extends MCP joint of index finger posterior interosseus a.
Supinator deep branch of radial n. MAIN SUPINATOR OF FOREARM interosseus recurrent a.
ABductor Pollicis Brevis (recurrent branch of) median n. aBducts thumb superficial palmar branches of radial a.
Flexor Pollicis Brevis (recurrent branch of) median n. flexes MCP joint of thumb superficial palmar branches of radial a.
Opponens Pollicis (recurrent branch of) median n. pulls thumb medially & forward across palm superficial palmar branches of radial a.
ABductor Digiti Minimi (deep branch of) ulnar n. aBducts little finger ulnar a.
Flexor Digiti Minimi (deep branch of) ulnar n. flexes little finger at MCP joint ulnar a.
Opponens Digiti Minimi (deep branch of) ulnar n. brings 5th metacarpal bone towards thumb ulnar a.
Adductor Pollicis (deep branch of) ulnar n. adducts thumb deep palmar arterial arch
Lumbricals lateral 2: median n.; medial 2: ulnar n. flexes fingers at MCP joints; EXTENDS FINGERS AT IP JOINTS(with interossei) superficial palmar arterial arch
Dorsal Interossei mm. (deep branch of) ulnar n. aBducts fingers from 3rd finger dorsal & palmar metacarpal a. (of deep palmar arch)
Palmar Interossei mm. (deep branch of) ulnar n. adducts fingers toward 3rd finger palmar metacarpal a. (of deep palmar arch)
Palmaris Brevis (superficial branch of) ulnar n. improves palmar grip (by wrinkling skin and deepening hollow of palm); covers/protects ulnar n. and a. ulnar a.
Pectoral Major medial and lateral pectoral ns. adducts and medially rotates arm pectoralis branch of thoracoacromial a.; lateral thoracic a. (lesser supply)
Pectoral Minor medial pectoral n. pulls shoulder down and forward (protraction) lateral thoracic a.
Serratus Anterior long thoracic n. rotates scapula and pulls scapula around thoracic cage lateral thoracic a.
Subclavius nerve to subclavius m. anchors and depresses the clavicle clavicular branch of thoracoacromial trunk
Created by: 1206645939
 

 



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