Test 2 Posterior Forearm Muscles Flashcards Preview

Gross Anatomy > Test 2 Posterior Forearm Muscles > Flashcards

Flashcards in Test 2 Posterior Forearm Muscles Deck (47):
0

superficial layer

-Brachioradialis
-Extensor carpi radialis longus
-extensor carpi radialis brevis
-extensor digitorum
-extensor digiti minimi
-extensor carpi ulnaris

1

Brachioradialis proximal attachment , origin

proximal 2/3 of lateral supraepicondylar ridge of humerus

2

Brachioradialis distal attachment insertion

lateral surface of distal end of radius proximal to styloid process

3

Brachioradialis innervation

radial nerve C5 C6 C7

4

Brachioradialis action

weak flexion of forearm, maximal when forearm is in mid pronated position

5

extensor carpi radialis longus proximal attchment origin

lateral supra epicondylar ridge of the humerus

6

extensor carpi radialis longus distal attachment insertion

dorsal aspect of base of 2nd metacarpal

7

extensor carpi radialis longus innervation

radial nerve C6 C7

8

extensor carpi radialis longus action

-extend and abduct hand at wrist joint

9

extensor carpi radialis brevis proximal attachment origin

lateral epicondyle of the humerus

10

extensor carpi radialis brevis distal attachment insertion

dorsal aspect of base of 3rd metacarpal

11

extensor carpi radialis brevis innervation

deep branch of radial nerve C7 C8

12

extensor carpi radialis brevis action

-extends and abducts hand at wrist
-active during fist clenching

13

extensor digitorum proximal attachment origin

lateral epicondyle of humerus

14

extensor digitorum distal attachment insertion

extensor expansion of medial four fingers

15

extensor digitorum innervation

posterior interosseous nerve C7 C8 = continuation of deep radial nerve

16

extensor digitorum action

-extends medial four fingers primarily at metacrpophalangeal joints
-secondarily at interphalangeal joints

17

extensor digiti minimi proximal attachment origin

lateral epicondyle of humerus

18

extensor digiti minimi distal attachment insertion

extensor expansion of 5th finger

19

extensor digiti minimi innervation

posterior interosseous nerve C7 C8 = continuation of deep branch of radial nerve

20

extensor digiti minimi action

-extends fifth finger primarily at metacarpophalangeal joint
-secondarily at interphalangeal joint

21

extensor carpi ulnaris proximal attachment origin

-lateral epicondyle of humerus
- posterior border of ulna via a shared aponeurosis

22

extensor carpi ulnaris distal attachment insertion

dorsal aspect of the base of the 5th metacarpal

23

extensor carpi ulnaris innervation

posterior interosseous nerve C7 C8 =continuation of deep branch of radial nerve

24

extensor carpi ulnaris action

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

25

deep layer of posterior forearm muscles

supinator

26

supinator proximal attachment origin

-lateral epicondyle of humerus
-radial collateral and annular ligaments
-supinator fossa
-crest of ulna

27

supinator distal attachment insertion

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

28

supinator innervation

deep branch of radial nerve C7 C8

29

supinator action

-supinates forearm
-rotates radius to turn palm anteriorly or superiorly (if elbow is flexed)

30

"outcropping" muscles of deep layer
posterior forearm

- abductor pollicis longus
-extensor pollicis longus
-extensor pollicis brevis
-extensor indicis

31

abductor pollicis longus proximal attachment origin

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

32

abductor pollicis longus distal attachment insertion

base of 1st metacarpal

33

abductor pollicis longus innervation

posterior interoseous nerv C7 C8 = continuation of deep branch of radial nerve

34

abductor pollicis longus action

-abducts thumb
-extends thumb at the carpometacarpal joint

35

extensor pollicis longus proximal attachment origin

posterior surface of middle 1/3 of ulna and interosseous membrane

36

extensor pollicis longus distal attachment insertion

dorsal aspect of base of distal phalanx of thumb

37

extensor pollicis longus innervation

posterior interosseous nerve C7 C8 = continuation of deep branch of radial nerve

38

extensor pollicis longus action

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

39

extensor pollicis brevis proximal attachment origin

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

40

extensor pollicis brevis distal attachment insertion

dorsal aspect of base of proximal phalanx of thumb

41

extensor pollicis brevis innervation

posterior interosseous nerve C7 C8 = continuation of the deep branch of radial nerve

42

extensor pollicis brevis action

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

43

extensor indicis proximal attachment origin

-posterior surface of distal 1/3 of ulna and interosseous membrane

44

extensor indicis distal attachment insertion

extensor expansion of 2nd finger

45

extensor indicis innervation

posterior interoseous nerve C7 C8 = continuation of deep branch of radial nerve

46

extensor indicis action

-extends 2nd finger (enabling its independent extension)
-helps extend hand at wrist