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Upper Limb Muscles > Forearm > Flashcards

Forearm Flashcards

0
Q

What is the insertion of pronator teres?

A

Middle of convexity of lateral surface of radius

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1
Q

What is the origin of pronator teres?

A

Ulnar head: coronoid process of ulna

Humeral head: medial epicondyle of humerus

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2
Q

What innervates pronator teres?

A

Median nerve (C6, C7)

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3
Q

What is the action of pronator teres?

A

Pronates and flexes forearm

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4
Q

What is the origin of flexor carpi radialis?

A

Medial epicondyle of humerus

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5
Q

What is the insertion of flexor carpi radialis?

A

Base of 2nd (3rd) metacarpal

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6
Q

What innervates flexor carpi radialis?

A

Median nerve (C6, C7)

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7
Q

What is the action of flexor carpi radialis?

A

Flexes and abducts hand at wrist

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8
Q

What is the origin of palmaris longus?

A

Medial epicondyle of humerus

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9
Q

What is the insertion of palmaris longus?

A

Distal half of flexor retinaculum, palmar aponeurosis

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10
Q

What innervates palmaris longus?

A

Median nerve (C7, C8)

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11
Q

What is the action of palmaris longus?

A

Flexes hand (at wrist) and tenses palmar aponeurosis

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12
Q

What is the origin of flexor carpi ulnaris?

A

Olecranon and posterior border of ulna (via aponeurosis)

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13
Q

What is the insertion of flexor carpi ulnaris?

A

Pisiform, hook of hamate, 5th metacarpal

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14
Q

What innervates flexor carpi ulnaris?

A

Ulnar nerve (C7, C8)

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15
Q

What is the action of flexor carpi ulnaris?

A

Flexes & adducts hand at wrist

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16
Q

What is the origin of flexor digitorum superficialis?

A

Humero-ulnar head: medial epicondyle of humerus & coronoid process of ulna
Radial head: oblique line of radius

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17
Q

What is the insertion of flexor digitorum superficialis?

A

Shafts (bodies) of middle phalanges of medial four digits

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18
Q

What innervates flexor digitorum superficialis?

A

Median nerve (C7, C8, T1)

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19
Q

What is the action of flexor digitorum superficialis?

A

Flexes wrist joint, proximal interphalangeal joints of middle four digits, & proximal phalanges at metacarpophalangeal joints

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20
Q

What is the origin of flexor digitorum profundus?

A

Proximal three quarters of medial and anterior surfaces of ulna and interosseous membrane

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21
Q

What is the insertion of flexor digitorum profundus?

A

Bases of distal phalanges of 2nd, 3rd, 4th, & 5th digits

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22
Q

What innervates flexor digitorum profundus?

A 
Lateral part (digits 2 & 3): median nerve (C8, T1) (anterior interosseous branch)
Medial part (digits 4 & 5): ulnar nerve (C8, T1)
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23
Q

What is the action of flexor digitorum profundus?

A

Flexes wrist joint; flexes distal interphalangeal joints of 2, 3, 4, & 5; assists with wrist flexion

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24
Q

What is the origin of flexor pollicis longus?

A

Anterior surface of radius and adjacent interosseous membrance

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25
Q

What is the insertion of flexor pollicis longus?

A

Base of distal phalanx of thumb

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26
Q

What innervates flexor pollicis longus?

A

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

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27
Q

What is the action of flexor pollicis longus?

A

Flexes wrist; flexes metacarpophalangeal and interphalangeal joints of thumb

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28
Q

What is the origin of pronator quadratus?

A

Distal quarter of anterior surface of ulna

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29
Q

What is the insertion of pronator quadratus?

A

Distal quarter of anterior surface of radius

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30
Q

What innervates pronator quadratus?

A

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

31
Q

What is the action of pronator quadratus?

A

Pronates forearm; deep fibers bind radius & ulna together

32
Q

What is the origin of brachioradialis?

A

Proximal two thirds of lateral supra-epicondylar ridge of humerus

33
Q

What is the insertion of brachioradialis?

A

Lateral surface of distal end of radius proximal to styloid process

34
Q

What innervates brachioradialis?

A

Radial nerve (C5, C6, C7)

35
Q

What is the action of brachioradialis?

A

Weak flexion of elbow joint, maximal when forearm is in mid-pronated position

36
Q

What is the origin of extensor carpi radialis longus?

A

Lateral supra-epicondylar ridge of humerus

37
Q

What is the insertion of extensor carpi radialis longus?

A

Dorsal aspect of base of 2nd metacarpal

38
Q

What innervates extensor carpi radialis longus?

A

Radial nerve (C6, C7)

39
Q

What is the action of extensor carpi radialis longus?

A

Extend and abduct wrist joint

40
Q

What is the origin of extensor carpi radialis brevis?

A

Lateral epicondyle of humerus (common extensor origin)

41
Q

What is the insertion of extensor carpi radialis brevis?

A

Dorsal aspect of base of 3rd metacarpal

42
Q

What innervates extensor carpi radialis brevis?

A

Deep branch of radial nerve (C7, C8)

43
Q

What is the action of extensor carpi radialis brevis?

A

Extend and abduct wrist joint; active during fist clenching

44
Q

What is the origin of extensor digitorum?

A

Lateral epicondyle of humerus (common extensor origin)

45
Q

What is the insertion of extensor digitorum?

A

Extensor expansions of medial four fingers

46
Q

What innervates extensor digitorum?

A

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

47
Q

What is the action of extensor digitorum?

A

Extend wrist joint; extend medial four fingers primarily at metacarpophalangeal joints, secondarily at interphalangeal joints

48
Q

What is the origin of extensor digiti minimi?

A

Lateral epicondyle of humerus (common extensor origin)

49
Q

What is the insertion of extensor digiti minimi?

A

Extensor expansion of 5th finger

50
Q

What innervates extensor digiti minimi?

A

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

51
Q

What is the action of extensor digiti minimi?

A

Extends wrist joint; extends 5th finger primarily at metacarpophalangeal joint, secondarily at interphalangeal joint

52
Q

What is the origin of extensor carpi ulnaris?

A

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

53
Q

What is the insertion of extensor carpi ulnaris?

A

Dorsal aspect of base of 5th metacarpal

54
Q

What innervates extensor carpi ulnaris?

A

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

55
Q

What is the action of extensor carpi ulnaris?

A

Extends and adducts wrist joint (also active during fist clenching)

56
Q

What is the origin of supinator?

A

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

57
Q

What is the insertion of supinator?

A

Lateral, posterior, and anterior surfaces of proximal third of radius

58
Q

What innervates supinator?

A

Deep branch of radial nerve (C7, C8)

59
Q

What is the action of supinator?

A

Supinates forearm; rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)

60
Q

What is the origin of abductor pollicis longus?

A

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

61
Q

What is the insertion of abductor pollicis longus?

A

Base of 1st metacarpal

62
Q

What innervates abductor pollicis longus?

A

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

63
Q

What is the action of abductor pollicis longus?

A

Extends wrist joint; abducts thumb and extends it at carpometacarpal joint

64
Q

What is the origin of extensor pollicis longus?

A

Posterior surface of middle third of ulna and interosseous membrane

65
Q

What is the insertion of extensor pollicis longus?

A

Dorsal aspect of base of distal phalanx of thumb

66
Q

What innervates extensor pollicis longus?

A

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

67
Q

What is the action of extensor pollicis longus?

A

Extends wrist joint; extends distal phalanx of thumb at interphalangeal joint; extends metacarpophalangeal and carpometacarpal joints

68
Q

What is the origin of extensor pollicis brevis?

A

Posterior surface of distal third of radius and interosseous membrane

69
Q

What is the insertion of extensor pollicis brevis?

A

Dorsal aspect of base of proximal phalanx of thumb

70
Q

What innervates extensor pollicis brevis?

A

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

71
Q

What is the action of extensor pollicis brevis?

A

Extends wrist joint; extends proximal phalanx of thumb at metacarpophalangeal joint; extends carpometacarpal joint

72
Q

What is the origin of extensor indicis?

A

Posterior surface of distal third of ulna and interosseous membrane

73
Q

What is the insertion of extensor indicis?

A

Extensor expansion of 2nd finger

74
Q

What innervates extensor indicis?

A

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

75
Q

What is the action of extensor indicis?

A

Extends wrist joint; extends 2nd finger (enabling its independent extension); helps extend hand at wrist

Upper Limb Muscles (8 decks)

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