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Medsci-UpExt-Exam2
Muscles of the upper extremity
Muscle | Innervation | Function | Blood 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 |