Posterior Forearm

Question 1

damaged radial nerve, still has ability to supinate forearm. Why?

Answer 1

fully functional musculocutaneous n remains

Question 2

proximal attachment of extensor capri ularis?

Answer 2

lat epicondyle of humerus and posterior border of ulna

Question 3

distal attachment of ext carpi ulnaris?

Answer 3

dorsal aspect of base of 5th metacarpal

Question 4

action of extensor carpi ulnaris?

Answer 4

extends and adducts hand at wrist

Question 5

blood supply to extensor carpi ulnaris?

Answer 5

radial collateral, radial recurrent, recurrent interosseous, and posterior interosseus arteries

Question 6

innervation of extensor carpi ulnaris?

Answer 6

posterior interosseous nerve

Question 7

proximal attachment of extensor pollicis brevis?

Answer 7

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

Question 8

distal attachment of extensor pollicis brevis?

Answer 8

-dorsal aspect of proximal phalanx of thumb

Question 9

actions of extensor pollicis brevis?

Answer 9

extends proximal phalanx of thumb at its metacarpophalangeal joint, also extends carpometacarpal joint

Question 10

blood supply to extensor pollicis brevis?

Answer 10

posterior interosseous and perforating branch of anterior

interosseous arteries

Question 11

innervation of extensor pollicis brevis?

Answer 11

posterior interosseus nerve

Question 12

proximal attachment of extensor pollicis longus?

Answer 12

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

Question 13

Distal Attachment of extensor pollicis longus

Answer 13

dorsal aspect of base of distal phalanx of thumb

Question 14

actions of extensor pollicis longus?

Answer 14

extends distal phalanx of thumb at its interphalangeal joint and extends the metacarpophalangeal and carpometacarpal joint

Question 15

blood supply to extensor pollicis longus?

Answer 15

posterior interosseous and perforating branch of anterior

interosseous arteries

Question 16

innervation of extensor pollicis longs?

Answer 16

posterior interosseous nerve

Question 17

what does the deep branch of the radial n continue as?

Answer 17

posterior interosseous nerve

Question 18

where does the superficial branch of radial nerve run?

Answer 18

lateral, beneath brachioradialis

Question 19

medial/ulnar border of anatomic snuff box?

Answer 19

extensor pollicis longus

Question 20

radial/lateral border of anatomic snuff box?

Answer 20

extensor pollicis brevis

Question 21

3rd muscle that runs with extensor pollicis brevis that makes up anatomic snuff box?

Answer 21

abductor pollicis longus

Question 22

floor of anatomic snuff box?

Answer 22

scaphoid (crushing fx risk)

Question 23

roof of snuff box?

Answer 23

superficial radial nerve branches

Question 24

what runs in snuff box?

Answer 24

radial artery

Question 25

all muscles of posterior forearm are innervated by what nerve and branch of nerve?

Answer 25

radial nerve: deep branch or the posterior interosseous nerve

Question 26

proximal attachment of brachioradialis?

Answer 26

proximal 2/3 of supraepicondylar ridge of humerus

Question 27

distal attachment of brachioradialis?

Answer 27

distal radius, proximal to styloid process

Question 28

action of brachioradialis?

Answer 28

flexes forearm when it is pronated (about midprone position)

Question 29

blood supply of brachioradialis?

Answer 29

radial collateral, recurrent radial, and radial arteries

Question 30

innervation of brachioradialis?

Answer 30

radial nerve

Question 31

proximal attachment of extensor carpi radials longus?

Answer 31

dorsal aspect of base of 2nd metacarpal

Question 32

action of extensor carpi radialis longus

Answer 32

extend and abduct hand at wrist

Question 33

blood supply extensor carpi radials longus?

Answer 33

radial collateral artery, radial recurrent artery, recurrent interosseous artery, and posterior interosseous artery

Question 34

innervation of extensor carpi radials longus?

Answer 34

radial n.

Question 35

proximal attachment of extensor carpi radials brevis?

Answer 35

lateral epicondyle of humerus

common extensor origin

Question 36

distal attachment of extensor carpi radial brevis

Answer 36

dorsal aspect of base of 3rd metacarpal

Question 37

blood supply for extensor carpi radialis brevis?

Answer 37

radial collateral, radial recurrent, recurrent interosseous, and
posterior interosseous arteries

Question 38

innervation of extensor carpi radialis brevis?

Answer 38

deep branch of radial n

Question 39

proximal attachment of extensor digitorum?

Answer 39

lateral epicondyle of humerus (common extensor origin)

Question 40

distal attachment of extensor digitorum?

Answer 40

extensor expansions of medial 4 fingers

Question 41

actions of extensor digitorum?

Answer 41

extends medial 4 fingers at metacarpophalangeal joints and somewhat at interphalangeal joints

Question 42

blood supply to extensor digitorum?

Answer 42

posterior interosseous artery, recurrent interosseous, and

perforating branch of the anterior interosseous arteries

Question 43

innervation of extensor digitorum?

Answer 43

posterior interosseous nerve

Question 44

proximal attachment of extensor digit minimi?

Answer 44

lateral epicondyle of humerus

Question 45

distal attachment of extensor digiti minimi?

Answer 45

extensor expansion of 5th finger

Question 46

action of extensor digiti minimi?

Answer 46

extends 5th finger at metacarpophalangeal joint and secondarily at interphalangeal joints

Question 47

blood supply to extensor digiti minima?

Answer 47

posterior interosseous, recurrent interosseous, and

perforating branch of the anterior interosseous arteries

Question 48

innervation of extensor digiti minimi?

Answer 48

posterior interosseous n