muscles of the arm and posterior forearm Flashcards Preview

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

Flashcards in muscles of the arm and posterior forearm Deck (66):
1

biceps brachii origin

short head: coracoid process of the scapula
long head: supraglenoid tubercle of the scapula

2

biceps brachii insertion

both the short and long head: tuberosity of the radius

3

biceps brachii innervation

musculocutaneous nerve (C5,C6)

4

biceps brachii action

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

the short head helps to resist dislocation of shoulder

5

brachialis origin

distal hald of the anterior surface of the humerus

6

brachialis insertion

coronoid process and tuberosity of the ulna

7

brachialis innervaton

Musculocutaneous nerve

8

brachialis action

flexes elbow joint in all positions

9

coracobrachialis origin

coracoid process of the scapula

10

coracobrachialis insertion

middle third of medial surface of humerus

11

coracobrachialis innervation

musculocutaneous nerve

12

coracobrachialis action

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

13

triceps origin of the long head

infreglenoid tubercule of the scapula

14

triceps origin of the lateral head

posterior surface of the humerus, superior to radial groove

15

triceps origin of the medial head

posterior surface of humerus inferior to the radial groove

16

triceps insertion (all three)

olecranon of the ulna and fasica of the forearm

17

triceps innervation (all three)

radial nerve

18

triceps action (all three)

-main extensor of the elbow joint
-long head extends shoulder joint and resists dislocation

19

anconeus origin

lateral epicondyle of humerus

20

anconeus insertion

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

21

anconeus innervation

radial nerve

22

anconeus action

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

23

Branchioradialis origin

lateral supracondylar ridge of the humerus

24

Brachioradialis insertion

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

25

brachioradialis innervation

radial nerve

26

brachioradials action

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

27

extensor carpi radialis longus origin

lateral supra-epicondylar ridge of humerus

28

extensor carpi radialis longus insertion

dorsal aspect of base of 2nd metacarpal

29

extensor carpi radialis longus innervation

radial nerve

30

extensor carpi radialis longus action

extend and abduct wrist joint
active during fist clenching

31

extensor carpi radialis brevis origin

lateral epicondyle of the humerus

32

extensor carpi radialis brevis insertion

dorsal aspect of base of 3rd metacarpal

33

extensor carpi radialis brevis innervtion

deep branch of the radial nerve

34

extensor carpi brevis action

-same as the extensor carpi radialis longus
-extends and abduct wrist joint
-active during fist clenching

35

extensor digitorum origin

lateral epicondyle of the humerus

36

extensor digitorum insertion

extensor expansion of medial four fingers

37

extensor digitorum innervation

deep branch of the radial nerve

38

extensor digitorum action

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

39

extensor digiti minimi origin

lateral epicondyle of the humerus

40

extensor digiti minimi insertion

adducts and extensor expansion of 5th finger

41

extensor digiti minimi innervation

posterior interosseous nerve,

42

extensor digiti minimi action

extends wrist joint
extends 5th finger mostly at the metacarophalangeal

43

extensor carpi ulnaris origin

lateral epicondyle of the humerus

44

extensor carpi ulnaris insertion

dorsal aspect of base of 5th metacarpal

45

extensor carpi ulnaris innervation

posterior interosseous nerve

46

extensor carpi ulnaris action

extends and adducts wrist joint

47

adductor pollicus longus origin

-outcropping muscle of the forearm
-posterior surface of proximal halves of ulna, radius, and interosseous membrane

48

adductor pollicus longus insertion

base of 1st metacarpal

49

adductor pollicus longus innervation

posterior interosseous nerve

50

adductor pollicus longus action

extends wrist joint
abduct thumb and extends it at carpometacarpal joint

51

extensor pollicis longus origin

posterior surface of middle third of ulna and interosseous membrane

52

extensor pollicis longus insertion

dorsal aspect of base of distal plalanx of thumb

53

extensor pollicis longus innervation

posterior interosseous nerve

54

extensor pollicis longus action

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

55

extensor pollicis brevis origin

posterior surface of distal third of radius and interosseous membrane

56

extensor pollicis brevis insertion

dorsal aspect of base of proximal phalanx of thumb

57

extensor pollicis brevis innervation

posterior interosseous nerve

58

extensor pollicis brevis action

-extends wrist joint
-extends proximal phalanx thumb at metacarpophalageal pharynx

59

extensor indicis origin

posterior surface of distal third of ulna and interosseous membrane

60

extensor indicis insertion

extensor expansion of 2nd finger

61

extensor indicis innervation

posterior interosseous nerve

62

extensor indicis action

-extends wrist at joint
-extends 2nd finger, helps extend hand at wrist

63

Supinator origin

Lateral epicondyle of humerus

64

Supinator insertion

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

65

Supinator innervation

Deep branch of radial nerve

66

Supinator action

Supinates forearm