Superficial Muscles Of Posterior Forearm

Question 1

What are the muscles in the superficial compartment of posterior forearm? (6)

Answer 1

Brachioradialis, extensor carpi radialis longus and brevis, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris

Question 2

What are they all innervated by?

Answer 2

Radial nerve

Question 3

Origin of brachioradialis

Answer 3

Proximal aspect of lateral supracondylar ridge of humerus

Question 4

Insertion of brachioradialis

Answer 4

Distal end of radius

Question 5

Action of brachioradialis

Answer 5

Flexes at elbow

Question 6

Origin of ECRL + ECRB

Answer 6

ECRL- lateral supracondylar ridge of humerus
ECRB- lateral epicondyle

Question 7

Insertion of ECRL + ECRB

Answer 7

Tendons attach to metacarpal bones II and III

Question 8

Action of ECRL + ECRB

Answer 8

Extends and abducts wrist

Question 9

Origin of extensor digitorum

Answer 9

Lateral epicondyle

Question 10

Insertion of extensor digitorum

Answer 10

Extensor hood of each finger

Question 11

Action of extensor digitorum

Answer 11

Extension of digits at IPJ and MCPJ

Question 12

Origin of extensor digiti minimi

Answer 12

Lateral epicondyle of humerus

Question 13

Insertion of extensor digiti minimi

Answer 13

Extensor hood of little finger

Question 14

Action of extensor digiti minimi

Answer 14

Extends little finger, contributes extension at wrist

Question 15

Origin of extensor carpi ulnaris

Answer 15

Lateral epicondyle of humerus

Question 16

Insertion of extensor carpi ulnaris

Answer 16

Base of metacarpal V

Question 17

Action of extensor carpi ulnaris

Answer 17

Extension and adduction of wrist