Posterior Forearm

Question 1

10 muscles of posterior forearm

Answer 1

supinator 
extensor carpi radialis longus
extensor carpi radialis brevis 
extensor digitorum
extensor digiti minimi
extensor carpi ulnaris
abductor pollicis longus
extensor pollicis brevis 
extensor pollicis longus
extensor indicis

Question 2

Origin of supinator

Answer 2

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

Question 3

Insertion of supinator

Answer 3

lateral/posterior/anterior surfaces of radius

Question 4

Innervation of supinator

Answer 4

radial nerve C5/6

Question 5

Function of supinator

Answer 5

supinates forearm

Question 6

Origin of extensor carpi radialis longus

Answer 6

lateral supracondylar ridge

Question 7

Insertion of extensor carpi radialis longus

Answer 7

base 2nd metacarpal

Question 8

Innervation of extensor carpi radialis longus

Answer 8

radial nerve C6/7

Question 9

Function of extensor carpi radialis longus

Answer 9

extends and abducts hand

Question 10

Origin of extensor carpi radialis brevis

Answer 10

lateral epicondyle of humerus

Question 11

Insertion of extensor carpi radialis brevis

Answer 11

base 3rd metacarpal

Question 12

Innervation of extensor carpi radialis brevis

Answer 12

radial nerve C7/8

Question 13

Function of extensor carpi radialis brevis

Answer 13

extends and abducts hand

Question 14

Origin of extensor digitorum

Answer 14

lateral epicondyle of humerus

Question 15

Insertion of extensor digitorum

Answer 15

extensor expansions of fingers 2-5

Question 16

Innervation of extensor digitorum

Answer 16

radial nerve C7/8

Question 17

Function of extensor digitorum

Answer 17

extends wrist, MCP 2-5, IP 2-5, abducts fingers 2-5

Question 18

Origin of extensor digiti minimi

Answer 18

lateral epicondyle of humerus

Question 19

Insertion of extensor digiti minimi

Answer 19

extensor expansion of 5th digit

Question 20

Innervation of extensor digit minimi

Answer 20

radial nerve C7/8

Question 21

Function of extensor digiti minimi

Answer 21

extends 5th finger and wrist

Question 22

Origin of extensor carpi ulnaris

Answer 22

lateral epicondyle of humerus and posterior surface of ulna

Question 23

Insertion of extensor carpi ulnaris

Answer 23

base 5th metacarpal

Question 24

Innervation of extensor carpi ulnaris

Answer 24

radial nerve C7/8

Question 25

Function of extensor carpi ulnaris

Answer 25

extends and adducts hand

Question 26

Origin of abductor pollicis longus

Answer 26

posterior surfaces of radius and ulna, interosseous membrane

Question 27

Insertion of abductor pollicis longus

Answer 27

base 1st metacarpal

Question 28

Innervation of abductor pollicis longus

Answer 28

radial nerve C7/8

Question 29

Function of abductor pollicis longus

Answer 29

abducts, extends and laterally rotates the thumb, abducts the hand

Question 30

Origin of extensor pollicis brevis

Answer 30

posterior surface of radius and interosseous membrane

Question 31

Insertion of extensor pollicis brevis

Answer 31

base 1st proximal phalanx

Question 32

Innervation of extensor pollicis brevis

Answer 32

radial nerve C7/8

Question 33

Function of extensor pollicis brevis

Answer 33

extends MCP, CMC of thumb and abducts hand

Question 34

Origin of extensor pollicis longus

Answer 34

posterior surface of ulna and interosseous membrane

Question 35

Insertion of extensor pollicis longus

Answer 35

base 1st distal phalanx

Question 36

Innervation of extensor pollicis longus

Answer 36

radial nerve C7/8

Question 37

Function of extensor pollicis longus

Answer 37

extends MCP, IP of thumb and abducts thumb

Question 38

Origin of extensor indicis

Answer 38

posterior surface of ulna and interosseous membrane

Question 39

Insertion of extensor indicis

Answer 39

extensor expansion of 2nd digit

Question 40

Innervation of extensor indicis

Answer 40

radial nerve C7/8

Question 41

Function of extensor indicis

Answer 41

extends index finger