Muscles of Posterior Compartment of Forearm

Question 1

Brachioradialis Insertion

Answer 1

Lateral surface of distal end of radius proximal to styloid process

Question 2

Brachioradialis Innervation

Answer 2

Radial nerve (C5, C6, C7)

Question 3

Brachioradialis Action

Answer 3

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

Question 4

Extensor carpi radialis longus Origin

Answer 4

Lateral supra-epicondylar ridge of humerus

Question 5

Extensor carpi radialis longus insertion

Answer 5

dorsal aspect of base of 2nd metacarpal

Question 6

Extensor carpi radialis longus innervation

Answer 6

Radial nerve (C6, C7)

Question 7

Extensor carpi radialis longus action

Answer 7

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

Question 8

Extensor carpi radialis brevis Origin

Answer 8

Lateral epicondyle of humerus (common extensor origin)

Question 9

Extensor carpi radialis brevis insertion

Answer 9

dorsal aspect of base of 3rd metacarpal

Question 10

Extensor carpi radialis brevis innervation

Answer 10

deep branch of radial nerve (C7, C8)

Question 11

Extensor carpi radialis brevis action

Answer 11

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

Question 12

Extensor digitorum Origin

Answer 12

Lateral epicondyle of humerus (common extensor origin)

Question 13

Brachioradialis Origin

Answer 13

Proximal two thirds of lateral supraepicondylar ridge of humerus