Muscles of Posterior Forearm Osseofascial Compartment

Question 1

extensor carpi radialis brevis (origin)

Answer 1

lateral epicondyle of humerus

Question 2

extensor carpi radialis brevis (insertion)

Answer 2

posterior surface of base of third metacarpal bone

Question 3

extensor carpi radialis brevis (nerve)

Answer 3

deep branch of radial nerve

Question 4

extensor carpi radialis brevis (action)

Answer 4

extends and abducts hand at wrist joint

Question 5

extensor digitorum (origin)

Answer 5

lateral epicondyle of humerus

Question 6

extensor digitorum (insertion)

Answer 6

middle and distal phalanges of medial four fingers

Question 7

extensor digitorum (nerve)

Answer 7

deep branch of radial nerve

Question 8

extensor digitorum (action)

Answer 8

extends fingers and hand

Question 9

extensor digiti minimi (origin)

Answer 9

lateral epicondyle of humerus

Question 10

extensor digiti minimi (insertion)

Answer 10

extensor expansion of little finger

Question 11

extensor digiti minimi (nerve)

Answer 11

deep branch of radial nerve

Question 12

extensor digiti minimi (action)

Answer 12

extends metacarpal phalangeal joint of little finger

Question 13

extensor carpi ulnaris (origin)

Answer 13

lateral epicondyle of humerus

Question 14

extensor carpi ulnaris (insertion)

Answer 14

base of fifth metacarpal bone

Question 15

extensor carpi ulnaris (nerve)

Answer 15

deep branch of radial nerve

Question 16

extensor carpi ulnaris (action)

Answer 16

extends and adducts hand at wrist joint

Question 17

anconeus (origin)

Answer 17

lateral epicondyle of humerus

Question 18

anconeus (insertion)

Answer 18

lateral surface of olecranon process of ulna

Question 19

anconeus (nerve)

Answer 19

radial nerve

Question 20

anconeus (action)

Answer 20

extends elbow joint

Question 21

supinator (origin)

Answer 21

lateral epicondyle of humerus, annular ligament of proximal radioulnar joint, and ulna

Question 22

supinator (insertion)

Answer 22

neck and shaft of radius

Question 23

supinator (nerve)

Answer 23

deep branch of radial nerve

Question 24

supinator (action)

Answer 24

supination of forearm

Question 25

abductor pollicis longus (origin)

Answer 25

posterior surface of shafts of radius and ulna

Question 26

abductor pollicis longus (insertion)

Answer 26

base of first metacarpal bone

Question 27

abductor pollicis longus (nerve)

Answer 27

deep branch of radial nerve

Question 28

abductor pollicis longus (action)

Answer 28

abducts and extends thumb

Question 29

extensor pollicis brevis (origin)

Answer 29

posterior surface of shaft of radius

Question 30

extensor pollicis brevis (insertion)

Answer 30

base of proximal phalanx of thumb

Question 31

extensor pollicis brevis (nerve)

Answer 31

deep branch of radial nerve

Question 32

extensor pollicis brevis (action)

Answer 32

extends metacarpophalangeal joint of thumb

Question 33

extensor pollicis longus (origin)

Answer 33

posterior surface of shaft of ulna

Question 34

extensor pollicis longus (insertion)

Answer 34

base of distal phalanx of thumb

Question 35

extensor pollicis longus (nerve)

Answer 35

deep branch of radial nerve

Question 36

extensor pollicis longus (action)

Answer 36

extends distal phalanx of thumb

Question 37

extensor indicis (origin)

Answer 37

posterior surface of shaft of ulna

Question 38

extensor indicis (insertion)

Answer 38

extensor expansion of index finger

Question 39

extensor indicis (nerve)

Answer 39

deep branch of radial nerve

Question 40

extensor indicis (action)

Answer 40

extends metacarpophalangeal joint of index finger