Superficial layer

Question 0

What is the distal attachment of brachioradialis?

Answer 0

lateral surface of distal end of radius proximal to styloid process

Question 1

What is the proximal attachment of brachioradialis?

Answer 1

proximal two thirds of lateral supra-epicondylar ridge of humerus

Question 2

What innervates brachioradialis?

Answer 2

radial nerve (C5, C6, C7)

Question 3

What are the main actions of brachioradialis?

Answer 3

relatively weak flexion of forearm, maximal when forearm is in midpronation position

Question 4

What is the proximal attachment of extensor carpi radialis longus?

Answer 4

lateral supra-epicondylar ridge of humerus

Question 5

What is the distal attachment of extensor carpi radialis longus?

Answer 5

dorsal aspect of base of 2nd metacarpal

Question 6

What innervates extensor carpi radialis longus?

Answer 6

Radial nerve (C6, C7)

Question 7

What are the main actions of extensor carpi radialis longus?

Answer 7

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

Question 8

What is the proximal attachment of extensor carpi radialis brevis?

Answer 8

lateral epicondyle of humerus (common extensor origin)

Question 9

What is the distal attachment of extensor carpi radialis brevis?

Answer 9

dorsal aspect of base of 3rd metacarpal

Question 10

What innervates extensor carpi radialis brevis?

Answer 10

deep branch of radial nerve (C7, C8)

Question 11

What are the main actions of extensor carpi radialis brevis?

Answer 11

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

Question 12

What is the proximal attachment of extensor digitorum?

Answer 12

lateral epicondyle of humerus (common extensor origin)

Question 13

What is the distal attachment of extensor digitorum?

Answer 13

extensor expansions of medial four fingers

Question 14

What innervates extensor digitorum?

Answer 14

posterior interosseous nerve (C7, C8) [continuation of deep branch of radial nerve]

Question 15

What are the main actions of extensor digitorum?

Answer 15

extends medial four fingers primarily at the metacarpophalangeal joints
secondarily at interphalangeal joints

Question 16

What is the proximal attachment of extensor digiti minimi?

Answer 16

lateral epicondyle of humerus (common extensor origin)

Question 17

What is the distal attachment of extensor digiti minimi?

Answer 17

extensor expansion of 5th finger

Question 18

What innervates extensor digiti minimi?

Answer 18

posterior interosseous nerve (C7, C8) [continuation of deep branch of radial nerve]

Question 19

What are the main actions of extensor digiti minimi?

Answer 19

extends 5th finger primarily at metacarpophalangeal joint

secondarily at interphalangeal joint

Question 20

What is the proximal attachment of extensor carpi ulnaris?

Answer 20

lateral epicondyle of humerus; posterior boarder of ulna via a shared aponeurosis

Question 21

What is the distal attachment of extensor carpi ulnaris?

Answer 21

dorsal aspect of base of 5th metacarpal

Question 22

What innervates extensor carpi ulnaris?

Answer 22

posterior interosseous nerve (C7, C8) [continuation of deep branch of radial nerve]

Question 23

What are the main actions of extensor carpi ulnaris?

Answer 23

extends and adducts hand at wrist joint (also active during fist clenching)