Posterior compartment of the forearm

Question 1

origin of the brachioradialis

Answer 1

lateral supracondylar ridge of humerus

Question 2

insertion of the brachioradialis

Answer 2

styloid process of radius

Question 3

action of the brachioradialis

Answer 3

flexion at elbow

supination of the forearm

Question 4

innervation of the brachioradialis

Answer 4

radial nerve

Question 5

origin of the extensor carpi radialis longus

Answer 5

lateral supracondylar ridge of humerus

Question 6

insertion of the extensor carpi radialis longus

Answer 6

tendon passes under extensor retinaculum and attaches to base of 2nd metacarpal

Question 7

action of the extensor carpi radialis longus

Answer 7

extension and abduction of hand at wrist

Question 8

innervation of the extensor carpi radialis longus

Answer 8

radial nerve

Question 9

origin of extensor carpi radialis brevis

Answer 9

common extensor tendon

Question 10

insertion of the extensor carpi radialis brevis

Answer 10

tendon passes under extensor retinaculum and inserts into base of 3rd metacarpal

Question 11

action of the extensor carpi radialis brevis

Answer 11

extension and abduction of hand at wrist

Question 12

innervation of the extensor carpi radialis brevis

Answer 12

deep branch of the radial nerve

Question 13

origin of the extensor digitorum

Answer 13

common extensor tendon

Question 14

insertion of the extensor digitorum

Answer 14

4 tendons fan out over dorsum of hand to form expansions near interphalangeal joints

Question 15

action of the extensor digitorum

Answer 15

extension of medial 4 fingers and extension of hand at wrist joint

Question 16

innervation of the extensor digitorum

Answer 16

deep branch of the radial nerve

Question 17

origin of the extensor digiti minimi

Answer 17

common extensor tendon

Question 18

insertion of the extensor digiti minimi

Answer 18

tendon passes under extensor retinaculum and inserts onto little finger

Question 19

action of the extensor digiti minimi

Answer 19

extension of little finger and extension of hand at wrist joint

Question 20

innervation of the extensor digiti minimi

Answer 20

deep branch of the radial nerve

Question 21

origin of the extensor carpi ulnaris

Answer 21

HUMERAL HEAD: common extensor tendon

ULNAR HEAD: shaft of the ulna

Question 22

insertion of the extensor carpi ulnaris

Answer 22

tendon passes under the extensor retinaculum and inserts into the base of the 5th metacarpal

Question 23

action of the extensor carpi ulnaris

Answer 23

extension and adduction of the hand at the wrist joint

Question 24

innervation of the extensor carpi ulnaris

Answer 24

deep branch of radial nerve

Question 25

origin of the anconeus

Answer 25

lateral epicondyle of the humerus

Question 26

insertion of the anconeus

Answer 26

olecranon + shaft of the ulna

Question 27

action of the anconeus

Answer 27

extension of the forearm at the elbow joint

Question 28

innervation of the anconeus

Answer 28

radial nerve

Question 29

origin of the supinator

Answer 29

lateral epicondyle of the humerus, radial collateral and annual ligaments of elbow joint, and ulna

Question 30

insertion of the supinator

Answer 30

upper 1/3 of radius

Question 31

action of the supinator

Answer 31

supination of forearm

Question 32

innervation of the suppinator

Answer 32

deep branch of radial nerve

Question 33

origin of the abductor pollicis longus

Answer 33

shafts of ulna and radius + interosseus membrane

Question 34

insertion of the abductor pollicis longus

Answer 34

tendon inserts into the base of the 1st metacarpal

Question 35

action of the abductor pollicis longus

Answer 35

abducts and extends thumb + abduction of hand at wrist joint

Question 36

innervation of the abductor pollicis longus

Answer 36

deep branch of radial nerve

Question 37

origin of extensor pollicis brevis

Answer 37

shaft of the radius + interosseous membrane

Question 38

insertion of the extensor pollicis brevis

Answer 38

base of the proximal phalanx of the thumb

Question 39

action of the extensor pollicis brevis

Answer 39

Extends proximal phalanx of thumb and 1st metacarpal

Question 40

innervation of the extensor pollcis brevis

Answer 40

deep branch of the radial nerve

Question 41

origin of the extensor pollicis longus

Answer 41

shaft of the ulna + interosseus membrane

Question 42

insertion of the extensor pollicis longus

Answer 42

base of the distal phalanx of the thumb

Question 43

action of the extensor pollicis longus

Answer 43

extension of the distal and proximal phalanges of the thumb and 1st metacarpal

Question 44

innervation of the extensor pollicis longus

Answer 44

deep branch of radial nerve

Question 45

origin of the extensor indicis

Answer 45

shaft of ulna + interosseus membrane

Question 46

insertion of extensor indicis

Answer 46

tendon inserts into the extensor expansion of the index finger

Question 47

action of extensor indicis

Answer 47

Extends phalanges of the index finger and extends hand at the wrist joint

Question 48

innervation of extensor indicis

Answer 48

deep branch of radial nerve