HAE Quiz 3: Muscles of Posterior Forearm

Question 1

Brachioradialis

Answer 1

O: lateral supracondylar ridge
I: radius
N: radial nerve
F: flexes forearm

Question 2

Extensor carpi radialis longus

Answer 2

O: lateral supracondylar ridge
I: metacarpal
N: radial nerve
F: extends and abducts wrist

Question 3

Extensor carpi radialis brevis

Answer 3

O: lateral epicondyle of humerus (common extensor tendon)
I: metacarpal
N: radial nerve
F: extends and abducts wrist

Question 4

Extensor digitorum

Answer 4

O: lateral epicondyle of humerus (common extensor tendon)
I: digits 2-5 via extensor expansion
N: radial nerve
F:extends wrist and digits 2-5

Question 5

Extensor digiti minimi

Answer 5

O: lateral epicondyle of humerus (common extensor tendon)
I: digit 5 via extensor expansion
N: radial nerve
F: extends little finger

Question 6

Extensor carpi ulnaris

Answer 6

O: lateral epicondyle of humerus (common extensor tendon)
I: metacarpal
N: radial nerve
F: extends and adducts wrist

Question 7

Supinator

Answer 7

O: lateral epicondyle of humerus (common extensor tendon)
I: radius
N: radial nerve
F: supinates forearm

Question 8

Abductor pollicis longus

Answer 8

O: ulna (midshaft), radius (midshaft), interosseous membrane
I: 1st metacarpal
N: radial nerve
F abducts thumb

Question 9

Extensor pollicis longus

Answer 9

O: ulna (distal shaft), interosseous membrane
I: distal phalanx of thumb
N: radial nerve
F: extends thumb

Question 10

Extensor pollicis brevis

Answer 10

O: radius (distal shaft), interosseous membrane
I: proximal phalanx of thumb
N: radial nerve
F: extends thumb

Question 11

Extensor indicies

Answer 11

O: ulna (distal shaft), interosseous membrane
I: digit 2 via extensor expansion
N: radial nerve
F: extens index finger