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Exam 2 > Muscles of forearm > Flashcards

Muscles of forearm Flashcards

0
Q

Pronator teres insertion

A

Middle convexity of lateral surface of radius

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1
Q

Pronator Teres (PT) origin

A

Ulnar head - coronoid process of ulna

Humeral head - medial epicondyle of humerus

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2
Q

Pronator teres innervation

A

Median nerve (C6, C7)

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3
Q

Pronator teres action

A

Pronates and flexes forearm

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4
Q

Flexor carpi radialis (FCR) origin

A

Medial epicondyle of humerus

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5
Q

FCR insertion

A

Base of 2nd metacarpal

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6
Q

FCR innervation

A

Median nerve (C6, C7)

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7
Q

FCR action

A

Flexes and abducts hand at wrist

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8
Q

Palmaris longus origin

A

Medial epicondyle of humerus

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9
Q

Palmaris longus insertion

A

Distal half of flexor retinaculum

Palmar aponeurosis

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10
Q

Palmaris longus innervation

A

Median nerve (C7, C8)

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11
Q

Palmaris longus action

A

Flexes hand at wrist

Tenses palmar aponeurosis

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12
Q

Flexor carpi ulnaris (FCU) origin

A

Humeral head and ulnar head

Olecranon and posterior border of ulna (via aponeurosis)

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13
Q

FCU insertion

A

Pisiform

Hook of hamate, 5th metacarpal

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14
Q

FCU innervation

A

Ulnar nerve (C7, C8)

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15
Q

FCU action

A

Flexes and adducts hand at wrist

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16
Q

Flexor digitorum superficialis (FDS) origin

A

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

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17
Q

FDS insertion

A

Shafts (bodies) of middle phalanges of medial 4 digits

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18
Q

FDS innervation

A

Median nerve (C7, C8, T1)

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19
Q

FDS action

A

Flexes wrist joint
Flexes proximal interphalangeal joints of middle four digits;
acting more strongly, it also flexes proximal phalanges at metacarpophalangeal joints

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20
Q

Flexor digitorum profundus (FDP) origin

A

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

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21
Q

FDP insertion

A

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

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22
Q

FDP innervation

A

Lateral part - (to digits 2 and 3) - median nerve (C8, T1) (anterior interosseous branch)
Medial part - (to digits 4 and 5) - Ulnar nerve (C8, T1)

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23
Q

FDP action

A

Flexes wrist joint
Flexes distal interphalangeal joints of digits 2,3,4, and 5
Assists with wrist flexion

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24
Q

Flexor pollicis longus (FPL) origin

A

Anterior surface of radius and adjacent interosseous membrane

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25
Q

FPL insertion

A

Base of distal phalanx of thumb

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26
Q

FPL innervation

A

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

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27
Q

FPL action

A

Flexes wrist

Flexes metacarpophalangeal and interphalangeal joints of thumb

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28
Q

Pronator quadratus origin

A

Distal quarter of anterior surface of ulna

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29
Q

Pronator quadratus insertion

A

Distal quarter of anterior surface of radius

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30
Q

Pronator quadratus innervation

A

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

31
Q

Pronator quadratus action

A

Pronates forearm

Deep fibers bind radius and ulna together

32
Q

Brachioradialis origin

A

Proximal two thirds of lateral supra-epicondylar ridge of humerus

33
Q

Brachioradialis insertion

A

Lateral surface of distal end of radius proximal to styloid process

34
Q

Brachioradialis insertion

A

Radial nerve (C5, C6, C7)

35
Q

Brachioradialis action

A

Relatively weak flexion of elbow joint

Maximal when forearm is in midpronated position

36
Q

Extensor carpi radialis longus origin

A

Lateral supra-epicondylar ridge of humerus

37
Q

Extensor carpi radialis longus insertion

A

Dorsal aspect of base of 2nd metacarpal

38
Q

Extensor carpi radialis longus innervation

A

Radial nerve (C6, C7)

39
Q

Extensor carpi radialis longus action

A

Extend and abduct wrist joint

40
Q

Extensor carpi radialis brevis origin

A

Lateral epicondyle of humerus (Common extensor origin)

41
Q

Extensor carpi radialis brevis insertion

A

Dorsal aspect of base of 3rd metacarpal

42
Q

Extensor carpi radialis brevis innervation

A

Deep branch of radial nerve (C7, C8)

43
Q

Extensor carpi radialis brevis action

A

Extend and abduct wrist joint

Active during fist clenching

44
Q

Extensor digitorum origin

A

Lateral epicondyle of humerus

45
Q

Extensor digitorum insertion

A

Extensor expansions of medial four fingers

46
Q

Extensor digitorum innervation

A

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

47
Q

Extensor digitorum action

A

Extend wrist joint

Extend medial four fingers primarily at metacarpophalangeal joints, secondary at interphalangeal joints

48
Q

Extensor digiti minimi origin

A

Lateral epicondyle of humerus

49
Q

Extensor digiti minimi insertion

A

Extensor expansion of 5th finger

50
Q

Extensor digiti minimi innervation

A

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

51
Q

Extensor digiti minimi action

A

Extends wrist joint

Extends 5th finger primarily at metacarpophalangeal joint, secondarily at interphalangeal joint

52
Q

Extensor carpi ulnaris origin

A

Lateral epicondyle of humerus

Posterior border of ulna via a shared aponeurosis

53
Q

Extensor carpi ulnaris insertion

A

Dorsal aspect of base of 5th metacarpal

54
Q

Extensor carpi ulnaris innervation

A

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

55
Q

Extensor carpi ulnaris action

A

Extends and adducts wrist joint

Also active during fist clenching

56
Q

Supinator origin

A

Lateral epicondyle of humerus
Radial collateral and anular ligaments
Supinator fossa
Crest of ulna

57
Q

Supinator insertion

A

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

58
Q

Supinator innervation

A

Deep branch of radial nerve (C7, C8)

59
Q

Supinator action

A

Supinates forarm

Rotates radius to turn palm anterior or superiorly if elbow is flexed

60
Q

Abductor pollicis longus origin

A

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

61
Q

Abductor pollicis longus insertion

A

Base of 1st metacarpal

62
Q

Abductor pollicis longus innervation

A

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

63
Q

Abductor pollicis longus action

A

Extends wrist joint

Abducts thumb and extends it at carpometacarpal joint

64
Q

Extensor pollicis longus origin

A

Posterior surface of middle third of ulna and interosseous membrane

65
Q

Extensor pollicis longus insertion

A

Dorsal aspect of base of distal phalanx of thumb

66
Q

Extensor pollicis longus innervation

A

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

67
Q

Extensor pollicis longus action

A

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

68
Q

Extensor pollicis brevis origin

A

Posterior surface of distal third of radius and interosseous membrane

69
Q

Extensor pollicis brevis insertion

A

Dorsal aspect of base of proximal phalanx of thumb

70
Q

Extensor pollicis brevis innervation

A

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

71
Q

Extensor pollicis brevis action

A

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

72
Q

Extensor indicis origin

A

Posterior surface of distal third of ulna and interosseous membrane

73
Q

Extensor indicis insertion

A

Extensor expansion of 2nd finger

74
Q

Extensor indicis innervation

A

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

75
Q

Extensor indicis action

A

Extends wrist joint
Extends 2nd finger (enabling its independent extension)
Helps extend hand at wrist

76
Q

What are the superficial muscles of the posterior forearm?

A 
Brachioradialis
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum
Extensor digiti minimi
Extensor carpi ulnaris

Exam 2 (13 decks)

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