Muscles of the forearm posterior compartment

Question 0

Brachioradialis distal attachment

Answer 0

Lateral surface of distal end of radius proximal to styloid process

Question 1

Brachioradialis proximal attachment

Answer 1

proximal 2/3s of lateral supraepicondylar ridge of humerus

Question 2

Brachioradialis innervation

Answer 2

Radial nerve C5, C6, C7

Question 3

Extensor carpi radialis longus Proximal attachment

Answer 3

Lateral supra-epicondylar ridge of humerus

Question 4

Extensor carpi radialis longus distal attachment

Answer 4

dorsal aspect of base of 2nd metacarpal

Question 5

Extensor carpi radialis longus innervation

Answer 5

Radial nerve C6, C7

Question 6

Extensor carpi radialis longus action

Answer 6

extend and abduct wrist joint; extensor carpi radialis brevis active during fist clenching

Question 7

Extensor carpi radialis Brevis proximal attachment

Answer 7

Lateral Epicondyle of humerus (common extensor origin)

Question 8

Extensor carpi radialis Brevis distal attachment

Answer 8

dorsal aspect of base of 3rd metacarpel

Question 9

Extensor carpi radialis Brevis innervation

Answer 9

deep branch of radial nerve C7, C8

Question 10

Extensor carpi radialis Brevis action

Answer 10

extend and abduct wrist joint; extensor carpi radialis brevis active during fist clenching

Question 11

Brachioradialis action

Answer 11

Relatively weak flexion of elbow joint, maximal when forearm is in midpronated position

Question 12

Extensor Digitorum proximal attachment

Answer 12

Lateral epicondyle of humerus

Question 13

Extensor Digitorum distal attachment

Answer 13

extensor expansions of medial four fingers

Question 14

Extensor Digitorum innervation

Answer 14

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

Question 15

Extensor Digitorum action

Answer 15

extend wrist joint, extend medial four fingers primarily at metacarpophalangeal joints, secondary at interphalangeal joints

Question 16

Extensor Digiti minimi proximal attachment

Answer 16

Lateral epicondyle of humerus

Question 17

Extensor Digiti minimi distal attachment

Answer 17

extensor expansion of 5th finger

Question 18

Extensor Digiti minimi innervation

Answer 18

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

Question 19

Extensor Digiti minimi action

Answer 19

extends wrist joint, extends 5th finger primarily at metacarpophalangeal joint, secondarily at interphalangeal joint

Question 20

Extensor carpi ulnaris proximal attachment

Answer 20

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

Question 21

Extensor carpi ulnaris distal attachment

Answer 21

dorsal aspect of base of 5th metacarpel

Question 22

Extensor carpi ulnaris innervation

Answer 22

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

Question 23

Extensor carpi ulnaris action

Answer 23

Extends and adducts wrist joint (also active during fist clenching)

Question 24

Supinator proximal attachment

Answer 24

lateral epicondyle of humerus, radial collateral and anular ligments, supinator fossa, crest of ulna

Question 25

Supinator distal attachment

Answer 25

lateral, posterior and anterior surfaces of proximal third of radius

Question 26

Supinator innervation

Answer 26

Deep branch of radial nerve C7, C8

Question 27

Supinator action

Answer 27

Supinates forearm; rotates radius to turn palm anteriorly of superiorly (if the elbow is flexed)

Question 28

abductor pollicis longus proximal attachment

Answer 28

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

Question 29

abductor pollicis longus distal attachment

Answer 29

base of 1st metacarpal

Question 30

abductor pollicis longus innervation

Answer 30

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

Question 31

abductor pollicis longus action

Answer 31

extends wrist joint, abducts thumb and extends it at carpometacarpel joint

Question 32

Extensor pollicis longus proximal attachment

Answer 32

posterior surface of middle third of ulna and interosseous membrane

Question 33

Extensor pollicis longus distal attachment

Answer 33

dorsal aspect of base of distal phalanx of thumb

Question 34

Extensor pollicis longus innervation

Answer 34

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

Question 35

Extensor pollicis longus action

Answer 35

extends wrist joint, extends distal phalanx of thumb at interphalangeal joint, extends metacarphalangeal joint, extends metacarpophalangeal and carpometacarpal joints

Question 36

Extensor pollicis brevis proximal attachment

Answer 36

posterior surface of distal third of radius and interosseous membrance

Question 37

Extensor pollicis brevis distal attachment

Answer 37

dorsal aspect of base of proximal phalanx thumb

Question 38

Extensor pollicis brevis innervation

Answer 38

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

Question 39

Extensor pollicis brevis action

Answer 39

Extends wrist joint, extends proximal phalanx of thumb at metacarpophalangeal joint, extends carpometacarpel joint

Question 40

Extensor indicis proximal attachment

Answer 40

posterior surface of distal third of ulna and interosseous membrane

Question 41

Extensor indicis distal attachment

Answer 41

extensor expansion of 2nd finger

Question 42

Extensor indicis innervation

Answer 42

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

Question 43

Extensor indicis actions

Answer 43

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