Muscles of Posterior Compartment of Forearm

Question 1

Brachioradialis - P

Answer 1

proximal 2/3rds of lateral supracondylar ridge of humerus

Question 2

Brachioradialis - D

Answer 2

lateral surface of distal end of radius proximal to styloid process

Question 3

Brachioradialis - N

Answer 3

radial nerve

Question 4

Brachioradialis - A

Answer 4

weak elbow flexion (max when thumb up)

Question 5

Extensor carpi radialis longus - P

Answer 5

lateral supracondylar ridge of humerus

Question 6

Extensor carpi radialis longus - D

Answer 6

base of 2nd metacarpal

Question 7

Extensor carpi radialis longus - N

Answer 7

radial nerve

Question 8

Extensor carpi radialis longus - A

Answer 8

wrist extension

wrist ABduction/radial deviation

Question 9

Extensor carpi radialis brevis - P

Answer 9

lateral epicondyle of humerus, posterior border of ulna via shared aponeurosis

Question 10

Extensor carpi radialis brevis - D

Answer 10

dorsal aspect of 3rd metacarpal

Question 11

Extensor carpi radialis brevis - N

Answer 11

radial nerve

Question 12

Extensor carpi radialis brevis - A

Answer 12

wrist extension

wrist ABduction/radial deviation

Question 13

Extensor digitorum - P

Answer 13

lateral epicondyle of humerus

Question 14

Extensor digitorum - D

Answer 14

extensor expansions of medial 4 fingers

Question 15

Extensor digitorum - N

Answer 15

radial nerve

Question 16

Extensor digitorum - A

Answer 16

wrist extension
extension fingers at MCP joints (primarily)
extension of fingers at IP joints (secondarily)

Question 17

Extensor digiti minimi - P

Answer 17

lateral epicondyle of humerus

Question 18

Extensor digiti minimi - D

Answer 18

extensor expansions of 5th fingers

Question 19

Extensor digiti minimi - N

Answer 19

radial nerve

Question 20

Extensor digiti minimi - A

Answer 20

wrist extension
extension of 5th finger at MCP joint (primarily)
extension of 5th finger at IP joint (secondarily)

Question 21

Extensor carpi ulnaris - P

Answer 21

lateral epicondyle of humerus

Question 22

Extensor carpi ulnaris - D

Answer 22

dorsal aspect of base of 5th metacarpal

Question 23

Extensor carpi ulnaris - N

Answer 23

radial nerve

Question 24

Extensor carpi ulnaris - A

Answer 24

wrist extension

wrist adduction/ulnar deviation

Question 25

Supinator - P

Answer 25

lateral epicondyle of humerus, RCL and anular ligaments, supinator fossa, crest of ulna

Question 26

Supinator - D

Answer 26

lateral, posterior, and anterior surfaces of proximal third of radius

Question 27

Supinator - N

Answer 27

radial nerve

Question 28

Supinator - A

Answer 28

forearm supination

Question 29

Abductor pollicis longus - P

Answer 29

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

Question 30

Abductor pollicis longus - D

Answer 30

base of 1st metacarpal

Question 31

Abductor pollicis longus - N

Answer 31

posterior interosseous nerve

Question 32

Abductor pollicis longus - A

Answer 32

wrist extension thumb ABduction thumb extension at CMC joint

Question 33

Extensor pollicis longus - P

Answer 33

posterior surface of middle third of ulna and interosseous membrane

Question 34

Extensor pollicis longus - D

Answer 34

base of distal phalanx of thumb

Question 35

Extensor pollicis longus - N

Answer 35

posterior interosseous nerve

Question 36

Extensor pollicis longus - A

Answer 36

wrist extension DIP extension of thumb MCP extension of thumb

Question 37

Extensor pollicis brevis - P

Answer 37

posterior surface of distal third of radius and interosseous membrane

Question 38

Extensor pollicis brevis - D

Answer 38

dorsal base of proximal phalanx of thumb

Question 39

Extensor pollicis brevis - N

Answer 39

posterior interosseous nerve

Question 40

Extensor pollicis brevis - A

Answer 40

wrist extension | extension at MCP joint of thumb

Question 41

Extensor indicis - P

Answer 41

posterior surface of distal third of ulna and interosseous membrane

Question 42

Extensor indicis - D

Answer 42

extensor expansion of 2nd finger

Question 43

Extensor indicis - N

Answer 43

posterior interosseous nerve

Question 44

Extensor indicis - A

Answer 44

wrist extension | 2nd finger extension

Question 45

Posterior Forearm Muscles - Superficial layer (6)

Answer 45

``` brachioradialis extensor carpi radialis longus extensor carpi radialis brevis extensor digitorum extensor digiti minimi extensor carpi ulnaris ```

Question 46

Posterior Forearm Muscles - Deep layer (1)

Answer 46

supinator

Question 47

Posterior Forearm Muscles - "Outcropping" of Deep layer (4)

Answer 47

abductor pollicis longus extensor pollicis longus extensor pollicis brevis extensor indicis