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Gross Anatomy: Unit Two. > muscles of the arm and posterior forearm > Flashcards

muscles of the arm and posterior forearm Flashcards

1
Q

biceps brachii origin

A

short head: coracoid process of the scapula

long head: supraglenoid tubercle of the scapula

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2
Q

biceps brachii insertion

A

both the short and long head: tuberosity of the radius

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3
Q

biceps brachii innervation

A

musculocutaneous nerve (C5,C6)

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4
Q

biceps brachii action

A

supinates the forearm, flexes the elbow, flexes the shoulder joint

the short head helps to resist dislocation of shoulder

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5
Q

brachialis origin

A

distal hald of the anterior surface of the humerus

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6
Q

brachialis insertion

A

coronoid process and tuberosity of the ulna

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7
Q

brachialis innervaton

A

Musculocutaneous nerve

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8
Q

brachialis action

A

flexes elbow joint in all positions

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9
Q

coracobrachialis origin

A

coracoid process of the scapula

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10
Q

coracobrachialis insertion

A

middle third of medial surface of humerus

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11
Q

coracobrachialis innervation

A

musculocutaneous nerve

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12
Q

coracobrachialis action

A

helps flex and adduct should joint, resisits disloction of the shoulder

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13
Q

triceps origin of the long head

A

infreglenoid tubercule of the scapula

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14
Q

triceps origin of the lateral head

A

posterior surface of the humerus, superior to radial groove

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15
Q

triceps origin of the medial head

A

posterior surface of humerus inferior to the radial groove

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16
Q

triceps insertion (all three)

A

olecranon of the ulna and fasica of the forearm

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17
Q

triceps innervation (all three)

A

radial nerve

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18
Q

triceps action (all three)

A
  • main extensor of the elbow joint

- long head extends shoulder joint and resists dislocation

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19
Q

anconeus origin

A

lateral epicondyle of humerus

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20
Q

anconeus insertion

A

lateral surface of the olcranon and superior part of posterior surface of the ulna

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21
Q

anconeus innervation

A

radial nerve

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22
Q

anconeus action

A

assiss triceps in extending the elbow
stablizes the elbow joint
adducts ulna during pronation

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23
Q

Branchioradialis origin

A

lateral supracondylar ridge of the humerus

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24
Q

Brachioradialis insertion

A

lateral suraface of distal end of radius proximal to the styloid process

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25
Q

brachioradialis innervation

A

radial nerve

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26
Q

brachioradials action

A

weak flexion of the elbow, maximal when forearm is in midpronated position

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27
Q

extensor carpi radialis longus origin

A

lateral supra-epicondylar ridge of humerus

28
Q

extensor carpi radialis longus insertion

A

dorsal aspect of base of 2nd metacarpal

29
Q

extensor carpi radialis longus innervation

A

radial nerve

30
Q

extensor carpi radialis longus action

A

extend and abduct wrist joint

active during fist clenching

31
Q

extensor carpi radialis brevis origin

A

lateral epicondyle of the humerus

32
Q

extensor carpi radialis brevis insertion

A

dorsal aspect of base of 3rd metacarpal

33
Q

extensor carpi radialis brevis innervtion

A

deep branch of the radial nerve

34
Q

extensor carpi brevis action

A
  • same as the extensor carpi radialis longus
  • extends and abduct wrist joint
  • active during fist clenching
35
Q

extensor digitorum origin

A

lateral epicondyle of the humerus

36
Q

extensor digitorum insertion

A

extensor expansion of medial four fingers

37
Q

extensor digitorum innervation

A

deep branch of the radial nerve

38
Q

extensor digitorum action

A
  • extends wrist

- extends medial four fingers at the metacarpophalangeal joint then at interphalangeal joints

39
Q

extensor digiti minimi origin

A

lateral epicondyle of the humerus

40
Q

extensor digiti minimi insertion

A

adducts and extensor expansion of 5th finger

41
Q

extensor digiti minimi innervation

A

posterior interosseous nerve,

42
Q

extensor digiti minimi action

A

extends wrist joint

extends 5th finger mostly at the metacarophalangeal

43
Q

extensor carpi ulnaris origin

A

lateral epicondyle of the humerus

44
Q

extensor carpi ulnaris insertion

A

dorsal aspect of base of 5th metacarpal

45
Q

extensor carpi ulnaris innervation

A

posterior interosseous nerve

46
Q

extensor carpi ulnaris action

A

extends and adducts wrist joint

47
Q

adductor pollicus longus origin

A
  • outcropping muscle of the forearm

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

48
Q

adductor pollicus longus insertion

A

base of 1st metacarpal

49
Q

adductor pollicus longus innervation

A

posterior interosseous nerve

50
Q

adductor pollicus longus action

A

extends wrist joint

abduct thumb and extends it at carpometacarpal joint

51
Q

extensor pollicis longus origin

A

posterior surface of middle third of ulna and interosseous membrane

52
Q

extensor pollicis longus insertion

A

dorsal aspect of base of distal plalanx of thumb

53
Q

extensor pollicis longus innervation

A

posterior interosseous nerve

54
Q

extensor pollicis longus action

A

extends wrist joint
extends phalanx of thumb at interphalangeal joint
extends metacarpophalangeal and carpometacarpal joint

55
Q

extensor pollicis brevis origin

A

posterior surface of distal third of radius and interosseous membrane

56
Q

extensor pollicis brevis insertion

A

dorsal aspect of base of proximal phalanx of thumb

57
Q

extensor pollicis brevis innervation

A

posterior interosseous nerve

58
Q

extensor pollicis brevis action

A
  • extends wrist joint

- extends proximal phalanx thumb at metacarpophalageal pharynx

59
Q

extensor indicis origin

A

posterior surface of distal third of ulna and interosseous membrane

60
Q

extensor indicis insertion

A

extensor expansion of 2nd finger

61
Q

extensor indicis innervation

A

posterior interosseous nerve

62
Q

extensor indicis action

A
  • extends wrist at joint

- extends 2nd finger, helps extend hand at wrist

63
Q

Supinator origin

A

Lateral epicondyle of humerus

64
Q

Supinator insertion

A

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

65
Q

Supinator innervation

A

Deep branch of radial nerve

66
Q

Supinator action

A

Supinates forearm

Gross Anatomy: Unit Two. (10 decks)

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