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Gross Anatomy I > Forearm Muscles > Flashcards

Forearm Muscles Flashcards

1
Q

pronator teres proximal attachment

A

ulnar head- coronoid process

humeral head- medial epicondyle, common flexor origin

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2
Q

pronator teres distal attachment

A

middle of convexity of lateral surface of radius

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3
Q

pronator teres innervation

A

Median nerve (C6, C7)

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4
Q

pronator teres muscle action

A

pronates and flexes forearm at elbow

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5
Q

flexor carpi radialis (FCR) proximal attachment

A

medial epicondyle, common flexor origin

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6
Q

flexor carpi radialis (FCR) distal attachment

A

base of 2nd metacarpal

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7
Q

FCR innervation

A

Median nerve (C6, C7)

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8
Q

FCR muscle action

A

flexes and abducts wrist

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9
Q

palmaris longus proximal attachment

A

medial epicondyle, common flexor origin

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10
Q

palmaris longus distal attachment

A

distal half of flexor retinaculum, apex of palmar aponeurosis

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11
Q

palmaris longus innervation

A

median nerve (C7, C8)

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12
Q

palmaris longus muscle action

A

flexes hand (at wrist) and tenses palmar aponeurosis

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13
Q

flexor carpi ulnaris (FCU) proximal attachment

A

humeral head: medial epicondyle, common flexor origin

ulnar head: olecranon and posterior border of ulna via aponeurosis

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14
Q

FCU distal attachment

A

pisiform, hook of hamate, 5th metacarpal

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15
Q

FCU innervation

A

ulnar nerve (C7, C8)

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16
Q

FCU muscle action

A

flexes and adducts hand at wrist

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17
Q

Flexor digitorum superficialis proximal attachment

A

humero-ulnar head: medial epicondyle, common flexor origin AND coronoid process

radial head: superior half of anterior border of radius

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18
Q

FDS distal attachment

A

shafts of middle phalanges of medial four digits

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19
Q

FDS innervation

A

median nerve (C7, C8, T1)

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20
Q

FDS muscle action

A

flexes middle phalanges at proximal interphalangeal joints, also flexes proximal phalanges at metacarpophalangeal joints

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21
Q

Flexor digitorum profundus (FDP) proximal attachment

A

medial and lateral parts: proximal 3/4 of medial and anterior surface of ulna and interosseous membrane

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22
Q

FDP distal attachment

A

medial part: bases of distal phalanges of 4th and 5th digits

lateral part: bases of distal phalanges of 2nd and 3rd digits

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23
Q

FDP medial part innervation

A

ulnar nerve (C8, T1)

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24
Q

FDP muscle action

A

medial part: flexes distal phalanges 4 and 5 at distal interphalangeal joints

lateral part: flexes distal phalanges 2 and 3 at distal interphalangeal joints

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25
Q

Flexor pollicis longus (FPL) proximal attachment

A

anterior surface of radius and adjacent interosseous membrane

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26
Q

FPL distal attachment

A

base of distal phalanx of thumb

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27
Q

FPL innervation

A

anterior interosseous nerve, from median nerve (C8, T1)

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28
Q

FPL muscle action

A

flexes phalanges of thumb

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29
Q

Pronator quadratus proximal attachment

A

distal 1/4 of anterior surface of ulna

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30
Q

pronator quadratus distal attachment

A

distal 1/4 of anterior surface of radius

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31
Q

pronator quadratus innervation

A

anterior interosseous nerve from median nerve (C8, T1)

32
Q

pronator quadratus muscle action

A

pronates forearm, deep fibers bind radius and ulna together

33
Q

FDP lateral part innervation

A

anterior interosseous nerve from median nerve (C8, T1)

34
Q

brachioradialis proximal attachment

A

proximal 2/3 of supra-epicondylar ridge of humerus

35
Q

brachioradialis distal attachment

A

lateral surface of distal end of radius proximal to styloid process

36
Q

brachioradialis innervation

A

radial nerve (C5, C6, C7)

37
Q

brachioradialis muscle action

A

relatively weak flexion of forearm; strongest when forearm is in midpronated position

38
Q

extensor carpi radialis longus (ECRL) proximal attachment

A

lateral supra-epicondylar ridge of humerus

39
Q

ECRL distal attachment

A

dorsal aspect of base of 2nd metacarpal

40
Q

ECRL innervation

A

radial nerve (C6, C7)

41
Q

Extensor carpi radialis brevis (ECRB) proximal attachment

A

lateral epicondyle; common extensor origin

42
Q

ECRB distal attachment

A

dorsal aspect of base of 3rd metacarpal

43
Q

ECRB innervation

A

deep branch of radial nerve (C7, C8)

44
Q

ECRB muscle action

A

extend and abduct hand at wrist joint

45
Q

Extensor digitorum proximal attachment

A

lateral epicondyle, common extensor origin

46
Q

extensor digitorum distal attachment

A

extensor expansions of medial 4 digits

47
Q

extensor digitorum innervation

A

deep branch of radial nerve (C7, C8)

48
Q

extensor digitorum muscle action

A

extends medial four digits at metacarpophalangeal joints, secondarily at interphalangeal joints

49
Q

extensor digiti minimi (EDM) proximal attachment

A

lateral epicondyle, common extensor origin

50
Q

EDM distal attachment

A

extensor expansion of 5th digit

51
Q

EDM innervation

A

deep branch of radial nerve (C7, C8)

52
Q

EDM muscle action

A

extends 5th digit primarily at metacarpophalangeal joint, secondarily at interphalangeal joint

53
Q

ECRL muscle action

A

extend and abduct hand at wrist joint; active during fist clenching

54
Q

Extensor carpi ulnaris (ECU) proximal attachment

A

lateral epicondyle of humerus; posterior border of ulna via shared aponeurosis

55
Q

ECU distal attachment

A

dorsal aspect of base of 5th metacarpal

56
Q

ECU innervation

A

deep branch of radial nerve (C7, C8)

57
Q

ECU muscle action

A

extends and adducts hand at wrist joint (also active during fist clenching)

58
Q

supinator proximal attachment

A

lateral epicondyle of humerus; radial collateral and anular ligaments; supinator fossa, crest of ulna

59
Q

supinator distal attachment

A

lateral, posterior, and anterior surfaces of proximal 1/3rd of radius

60
Q

supinator innervation

A

deep branch of radial nerve (C7, C8)

61
Q

supinator muscle action

A

supinates forearm; rotates radius to turn palm anteriorly or superiorly (if elbow is fixed)

62
Q

extensor indicis (EI) proximal attachment

A

posterior surface of distal third of ulna and interosseous membrane

63
Q

Extensor indicis muscle action

A

extends 2nd digit (enabling independent extension), helps extend hand at wrist

64
Q

Abductor pollicis longus (APL) proximal attachment

A

posterior surface of proximal halves of ulna, radius, and interosseous membrane

65
Q

APL distal attachment

A

base of 1st metacarpal

66
Q

APL innervation

A

posterior interosseous nerve, continuation of deep branch of radial nerve (C7, C8)

67
Q

APL muscle action

A

abducts thumb and extends it at carpometacarpal joint

68
Q

Extensor pollicis longus (EPL) proximal attachment

A

posterior surface of middle third of ulna and interosseous membrane

69
Q

EPL distal attachment

A

dorsal aspect of base of distal phalanx of thumb

70
Q

EPL innervation

A

posterior interosseous nerve, continuation from deep branch of radial nerve, (C7, C8)

71
Q

EPL muscle action

A

extends distal phalanx of thumb at interphalangeal joint, extends metacarpophalangeal and carpometacarpal joints

72
Q

Extensor pollicis brevis (EPB) proximal attachment

A

posterior surface of distal 1/3rd of radius and interosseous membrane

73
Q

EPB distal attachment

A

dorsal aspect of base of proximal phalanx of thumb

74
Q

EPB innervation

A

posterior interosseous nerve, continuation of deep branch of radial nerve, (C7, C8)

75
Q

EPB muscle action

A

extends proximal phalanx of thumb at metacarpophalangeal joint, extends carpometacarpal joint

76
Q

Extensor Indicis distal attachment

A

extensor expansion of 2nd digit

77
Q

extensor indicis innervation

A

posterior interosseous nerve, continuation of deep branch of radial nerve (C7, C8)

Gross Anatomy I (4 decks)

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