Tues 5/26 - Dorsal forearm & dorsum of hand

Question 1

Insertion of brachioradialis

Answer 1

styloid process of the radius

Question 2

innervation of brachioradialis

Answer 2

radial nerve c5-c6

Question 3

action of brachioradialis

Answer 3

elbow: flexion
forearm: semipronation

Question 4

origin of extensor carpi radialis longus

Answer 4

lateral supracondylar ridge of distal humerus, lateral intermuscular septum

Question 5

insertion of extensor carpi radialis longus

Answer 5

2nd metacarpal (base)

Question 6

innervation of extensor carpi radialis longus

Answer 6

radial nerve c6-c7

Question 7

action of extensor carpi radialis longus

Answer 7

elbow: weak flexion
wrist: extension and abduction

Question 8

origin of extensor carpi radialis brevis

Answer 8

lateral epicondyle of humerus

Question 9

insertion of extensor carpi radialis brevis

Answer 9

3rd metacarpal (base)

Question 10

innervation of extensor carpi radialis brevis

Answer 10

radial nerve c7-c8

Question 11

action of extensor carpi radialis brevis

Answer 11

elbow: weak flexion
wrist: extension and abduction

Question 12

origin of extensor digitorum

Answer 12

common head (lateral epicondyle of humerus)

Question 13

insertion of extensor digitorum

Answer 13

dorsal digital expansion of 2nd-5th digits

Question 14

innervation of extensor digitorum

Answer 14

posterior interosseous branch of the radial nerve c7-c8

Question 15

action of extensor digitorum

Answer 15

wrist: extension

MCP, PIP, and DIP of 2nd-5th digits: extension/abduction of fingers

Question 16

origin of extensor digiti minimi

Answer 16

common head (lateral epicondyle of humerus)

Question 17

insertion of extensor digiti minimi

Answer 17

dorsal digital expansion of 5th digit

Question 18

innervation of extensor digiti minimi

Answer 18

posterior interosseous branch of the radial nerve c7-c8

Question 19

action of extensor digit minimi

Answer 19

wrist: extension, ulnar abduction of hand

MCP, PIP, and DIP of 5th digit: extension and abduction of 5th digit

Question 20

origin of extensor carpi ulnaris

Answer 20

common head (lateral epicondyle of humerus),
ulnar head (dorsal surface)

Question 21

insertion of extensor carpi ulnaris

Answer 21

base of 5th metacarpal

Question 22

innervation of extensor carpi ulnaris

Answer 22

posterior interosseous branch of the radial nerve c7-c8

Question 23

action of extensor carpi ulnaris

Answer 23

wrist: extension, adduction (ulnar deviation) of hand

Question 24

origin of abductor pollicis longus

Answer 24

radius and ulna (dorsal surfaces, interosseous membrane)

Question 25

insertion of abductor pollicis longus

Answer 25

base of 1st metacarpal

Question 26

innervation of abductor pollicis longus

Answer 26

posterior interosseous branch of the radial nerve c7-c8

Question 27

action of abductor pollicis longus

Answer 27

radiocarpal joint: abduction of the hand, | carpometacarpal joint of thumb: abduction

Question 28

origin of extensor pollicis brevis

Answer 28

radius (posterior surface and interosseous membrane)

Question 29

insertion of extensor pollicis brevis

Answer 29

base of proximal phalanx of thumb

Question 30

innervation of extensor pollicis brevis

Answer 30

posterior interosseous branch of the radial nerve c7-c8

Question 31

action of extensor pollicis brevis

Answer 31

radiocarpal joint: abduction (radial deviation) of hand, | carpometacarpal and MCP of thumb: extension

Question 32

origin of extensor pollicis longus

Answer 32

ulna (posterior surface) and interosseous membrane

Question 33

insertion of extensor pollicis longus

Answer 33

base of distal phalanx of thumb

Question 34

innervation of extensor pollicis longus

Answer 34

posterior interosseous branch of the radial nerve c7-c8

Question 35

action of extensor pollicis longus

Answer 35

wrist: extension and abduction (radial deviation) of hand, carpometacarpal of thumb: adduction, MCP and IP of thumb: extension

Question 36

origin of extensor indicis

Answer 36

ulna (posterior surface) and interosseous membrane

Question 37

insertion of extensor indicis

Answer 37

posterior digital extension of 2nd digit

Question 38

innervation of extensor indicis

Answer 38

posterior interosseous branch of the radial nerve c7-c8

Question 39

action of extensor indicis

Answer 39

wrist: extension | MCP, PIP, and DIP of 2nd digit: extension

Question 40

origin of supinator

Answer 40

olecranon, lateral epicondyle of humerus, radial collateral ligament, annular ligament of radius

Question 41

insertion of supinator

Answer 41

radius (between radial tuberosity and insertion of pronator teres)

Question 42

innervation of supinator

Answer 42

posterior interosseous branch of the radial nerve c6-c7

Question 43

action of supinator

Answer 43

radioulnar joints: supination

Question 44

NOTE - DIP, IP, MCP, PIP abbreviations

Answer 44

DIP - distal interphalangeal IP - interphalangeal MCP - metacarpophalangeal PIP - proximal interphalangeal

Question 45

Origin of brachioradialis

Answer 45

distal humerus (distal surface), lateral intermuscular septum