Muscles of the Posterior Fascial Compartment of the Forearm : OINA

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 3rd metacarpal bone

Question 3

Extensor carpi radialis brevis: Innervaton

Answer 3

Deep branch of radial nerve; C7-8

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: Innervation

Answer 7

Deep branch of radial nerve; C7-8

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: Innervation

Answer 11

Deep branch of radial nerve; C7-8

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 5th metacarpal bone

Question 15

Extensor carpi ulnaris: Innervation

Answer 15

Deep branch of radial nerve; C7-8

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: Innervation

Answer 19

Radial nerve; C7-8, T1

Question 20

Anconeus: Action

Answer 20

Extends elbow joint

Question 21

Supinator: Origin

Answer 21

Lateral epicondyle of humerus, anular ligament of proximal radioulnar joint, and ulna

Question 22

Supinator: Insertion

Answer 22

Neck and shaft of radius

Question 23

Supinator: Innervation

Answer 23

Deep branch of radial nerve; C5-6

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 1st metacarpal bone

Question 27

Abductor pollicis longus: Innervation

Answer 27

Deep branch of radial nerve; C7-8

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: Innervation

Answer 31

Deep branch of radial nerve; C7-8

Question 32

Extensor pollicis brevis: Action

Answer 32

Extends metacarpophalangeal joints 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: Innervation

Answer 35

Deep branch of radial nerve; C7-8

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: Innervation

Answer 39

Deep branch of radial nerve; C7-8

Question 40

Extensor indicis: Action

Answer 40

Extends metacarpophalangeal joint of index finger