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123 Cards in this Set
- Front
- Back
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What are the superficial muscles of the flexor aspect of the forearm?
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Pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris
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What is the origin of pronator teres?
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Humeral head: medial supracondylar ridge; ulnar head: coronoid process
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What is the insertion of pronator teres?
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middle lateral surface of radius
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What nerve innervates pronator teres?
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Median--C6/7
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What are the actions of pronator teres?
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pronate forearm; assist flexion of forearm
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What is the origin of flexor carpi radialis?
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medial epicondyle
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What is the insertion of flexor carpi radialis?
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base of 2nd and 3rd metacarpals
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What nerve innervates flexor carpi radialis?
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median, C6/7
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What are the actions of flexor carpi radialis?
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flex wrist, radial deviation, assist pronation
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What is the origin of palmaris longus?
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medial epicondyle
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What is the insertion of palmaris longus?
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palmar aponeurosis
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What nerve innervates palmaris longus?
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median--C7/8
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What are the actions of palmaris longus?
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flex wrist (absent in some people)
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What is the origin of flexor carpi ulnaris?
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Humeral head: medial epicondyle; ulnar head: olecranon and adjacent ulnar shaft
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What is the insertion of flexor carpi ulnaris?
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pisiform, hamate, 5th MC
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What nerve innervates flexor carpi ulnaris?
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Ulnar--C8/T1
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What are the actions of flexor carpi ulnaris?
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flex wrist, ulnar deviation of hand
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What are the muscles in the intermediate layer of the flexor aspect of the forearm?
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flexor digitorum superficialis
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What is the origin of flexor digitorum superficialis?
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humeroulnar head: medial epicondyle and coranoid process; radial head: anterior upper 1/2 of radius
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What is the insertion of flexor digitorum superficialis?
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base of middle phalanx of digits 2-5
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What nerve innervates flexor digitorum superficialis?
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median-C7/8/T1
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What are the actions of flexor digitorum superficialis?
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flex middle phalanges; assist MCP flexion, wrist flexion
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What are the muscles in the deep layer of the flexor aspect of the forearm?
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flexor digitorum profundus, flexor pollicis longus, pronator quadratus
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What is the origin of flexor digitorum profundus?
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proximal 2/3 of shaft of ulna, interosseus membrane
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What is the insertion of flexor digitorum profundus?
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base of distal phalanx of digits 2-5
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What nerve innervates flexor digitorum profundus?
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Radial part: median C8/T1; Ulnar part: ulnar C8/T1
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What are the actions of flexor digitorum profundus?
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flex at distal IP joint of digits 2-5, secondary flexor at proximal IP joint of digits 2-5; assist wrist flexion
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What is the origin of flexor pollicis longus?
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middle 1/2 of anterior radius and adj interosseus membrane
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What is the insertion of flexor pollicis longus?
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base of dital phalanx of thumb
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What nerve innervates flexor pollicis longus?
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median--C7/8/T1
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What are the actions of flexor pollicis longus?
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flex thumb, beginning at IP joint
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What is the origin of pronator quadratus?
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distal 1/4 of anterior surface of ulna
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What is the insertion of pronator quadratus?
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distal 1/4 of anterolateral surface of radius
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What nerve innervates pronator quadratus?
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median--C7/8/T1
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What are the actions of pronator quadratus?
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pronate forearm
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What muscles form the superficial layer of the extensor aspect of the forearm?
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brachioradialis, extensor carpi radialis longus/brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris
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What is the origin of brachioradialis?
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lateral supracondylar ridge
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What is the insertion of brachioradialis?
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lateral side of distal radius
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What nerve innervates brachioradialis?
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radial--C5/6
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What are the actions of brachioradialis?
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flex forearm, assist pronation and supination to neutral from extremes
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What is the origin of extensor carpi radialis longus?
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lateral supracondylar ridge
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What is the insertion of extensor carpi radialis longus?
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dorsum of base of 2nd MC
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What nerve innervates extensor carpi radialis longus?
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radial--C6/7
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What are the actions of extensor carpi radialis longus?
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extension at wrist, radial deviation
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What is the origin of extensor carpi radialis brevis?
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lateral epicondyle of humerus
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What is the insertion of extensor carpi radialis brevis?
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dorsum of base of 3rd MC
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What nerve innervates extensor carpi radialis brevis?
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radial--C6/7
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What are the actions of extensor carpi radialis brevis?
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extension at wrist, radial deviation
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What is the origin of extensor digitorum?
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lateral epicondyle of humerus
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What is the insertion of extensor digitorum?
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extensor expansion of digits 2-5 (thus to dorsum of proximal/middle/distal phalanges)
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What nerve innervates extensor digitorum?
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radial--C6/7/8
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What are the actions of extensor digitorum?
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extend at MCP and IP joints, assist wrist extension
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What is the origin of extensor digiti minimi?
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lateral epicondyle of humerus
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What is the insertion of extendor digiti minimi?
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extensor expansion of little finger
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What nerve innervates extensor digiti minimi?
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radial--C6/7/8
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What are the actions of extensor digiti minimi?
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extension at MCP and IP joints of little finger
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What is the origin of extensor carpi ulnaris?
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lateral epicondyle of humerus and midshaft of posterior ulna
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What is the insertion of extensor carpi ulnaris?
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dorsum of base of 5th metacarpal
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What nerve innervates extensor carpi ulnaris?
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radial--C6/7/8
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What are the actions of extensor carpi ulnaris?
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extend and ulnarly deviate hand at wrist
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What are the muscles in the deep layer of the extensor aspect of the forearm?
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supinator, abductor pollicis longus, extensor pollicis brevis, extensor pollicis longus, extensor indicus
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What is the origin of supinator?
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lateral epicondyle of humerus, lateral and annular ligaments, supinator crest of ulna
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What is the insertion of supinator?
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lateral and anterior surface of proximal 1/3 of radius
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What nerve innervates the supinator?
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radial--C5/6
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What are the actions of supinator?
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supinate forearm
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What is the origin of abductor pollicis longus?
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posterior surfaces of middle 1/3 of radius, ulna, and interosseus membrane
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What is the insertion of abductor pollicis longus?
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lateral side of base of 1st metacarpal
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What nerve innervates abductor pollicis longus?
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radial--C6/7
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What are the actions of abductor pollicis longus?
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abduct thumb at CMC joint, radially deviate and flex hand at wrist
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What is the origin of extensor pollicis brevis?
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posterior surface of distal radius, interosseus membrane
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What is the insertion of extensor pollicis brevis?
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dorsum of base of proximal phalanx of thumb
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What nerve innervates the extensor pollicis brevis?
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radial--C6/7
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What are the actions of extensor pollicis brevis?
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extend thumb at MCP joint, assist extension at CMC joint, assist radial deviation
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What is the origin of extensor pollicis longus?
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middle 1/3 of posterior shaft of ulna and interosseus membrane (just distal to APL)
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What is the insertion of extensor pollicis longus?
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dorsum of base of distal phalanx of thumb
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What nerve innervates extensor pollicis longus?
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radial--C7/8
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What are the actions of extensor pollicis longus?
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extend IP and MCP joints of thumb, assist radial deviation
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What is the origin of extensor indicus?
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distal shaft of ulna, interosseus membrane
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What is the insertion of extensor indicus?
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joins extensor digitorum to index finger
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What nerve innervates extensor indicus?
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radial--C7/8
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What are the actions of extensor indicus?
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extend index finger at IP and MCP joints, assist adduction of index finger at MCP joint
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What are the muscles of the thenar region of the hand?
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abductor pollicis brevis, flexor pollicis brevis, opponens pollicis, adductor pollicis
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What is the origin of abductor pollicis brevis?
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flexor retinaculum, scaphoid and trapezium
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What is the insertion of abductor pollicis brevis?
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radial side of proximal phalanx of thumb
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What nerve innervates abductor pollicis brevis?
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medial--C8/T1
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What are the actions of abductor pollicis brevis?
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abduct thumb at CMC joint, assist flexion and MCP joint, assist extension at IP joint
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What is the origin of flexor pollicis brevis?
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flexor retinaculum and trapezium
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What is the insertion of flexor pollicis brevis?
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base of palmer surface of proximal phalanx of thumb
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What nerve innervates flexor pollicis brevis?
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median--C8/T1
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What are the actions of flexor pollicis brevis?
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flex MCP joint, assist opposition and adduction of thumb
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What is the origin of opponens pollicis?
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flexor retinaculum and trapezium
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What is the insertion of opponens pollicis?
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length of radial side of palmer surface of 1st MC
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What nerve innervates the opponens pollicis?
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median C8/T1
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What are the actions of opponens pollicis?
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opposition of thumb (draws 1st MC across palm, rotating it palmerly at the same time)
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What is the origin of adductor pollicis?
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transverse head: palmer surface of body of 3rd MC; oblique head: palmar surface of bases of 2nd and 3rd MC, capitate, trapezoid, and trapezium
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What is the insertion of adductor pollicis?
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ulnar side of palmar surface of base of proximal phalanx of thumb
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What nerve innervates the adductor pollicis?
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ulnar (deep branch)--C8/T1
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What are the actions of adductor pollicis?
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adduct thumb at CMC joint, assist flexion at CMC joint, assist opposition
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What muscles are part of the hypothenar region of the hand?
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abductor digiti minimi, flexor digiti minimi brevis, opponens digiti minimi
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What is the origin of abductor digiti minimi?
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pisiform, also often tendon of flexor carpi ulnaris
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What is the insertion of abductor digiti minimi?
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ulnar surface of base of proximal phalanx of little finger
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What nerve innervates abductor digiti minimi?
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ulnar (deep branch)--C8/T1
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What are the actions of abductor digiti minimi?
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abduct little finger at MCP joint; assist flexion at MCP joint
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What is the origin of flexor digiti minimi brevis?
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hook of hamate and flexor retinaculum
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What is the insertion of flexor digiti minimi brevis?
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ulnarly and slightly palmerly of proximal phalanx of little finger
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What nerve innervates flexor digiti minimi brevis?
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ulnar (deep branch)--C8/T1
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What are the actions of flexor digiti minimi brevis?
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flex proximal phalanx of little finger
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What is the origin of opponens digiti minimi?
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hook of hamate and flexor retinaculum
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What is the insertion of opponens digiti minimi?
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ulnar border of shaft of 5th MC
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What nerve innervates opponens digiti minimi?
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ulnar (deep branch)--C8/T1
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What are the actions of opponens digiti minimi?
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draws little finger and 5th MC anteriorly and rotates it palmerly; brings into opposition with thumb and deepens hollow of hand
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What is the origin of the lumbricals?
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1st and 2nd: radial sides of flexor digitorum tendons to index and middle finger; 3rd and 4th: adj sides of flexor digitorum profundus tendons to middle and ring, and ring and little fingers
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What is the insertion of the lumbricals?
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radial sides of extensor expansions (dorsal hood) of digits 2-5
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What nerve innervates the lumbricals?
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1st and 2nd: median; 3rd and 4th: ulnar (deep branch)--C8/T1
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What are the actions of the lumbricals?
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flex MCP joints, extend IP joints
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What is the origin of the dorsal interossei?
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adj surfaces of 1st/2nd, 2nd/3rd, 3rd/4th, and 4th/5th MCs
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What is the insertion of the dorsal interossei?
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1st: radial side of base of prox phal of 2nd digit & dorsal hood; 2nd: radial side of base of prox phal of 3rd digit & dorsal hood; 3rd: ulnar side of base of prox phal of 3rd digit & dorsal hood; 4th: ulnar side of base of prox phal of 4th digit & dorsal hood
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What nerve innervates the dorsal interossei?
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ulnar (deep branch)--C8/T1
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What are the actions of the dorsal interossei?
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abduct 2nd/3rd/& 4th digits (away from 3rd digit), assist flexion at MCP joints & extension at IP joints
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What is the origin of the palmar interossei?
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1st: ulnar side of 2nd MC; 2nd: radial side of 4th MC; 3rd: radial side of 5th MC
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What is the insertion of the palmar interossei?
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1st: ulnar side of prox phal of 2nd digit and dorsal hood;
2nd: radial side of prox phal of 4th digit and dorsal hood; 3rd: radial side of prox phal of 5th digit and dorsal hood |
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What nerve innervates the palmar interossei?
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ulnar (deep branch)--C8/T1
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What are the actions of the palmar interossei?
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adduct 2nd/4th/5th digits, assist flexion at MCP joints and extend at IP joints
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