Forearm and wrist

Question 1

What is the common insertion of the muscles of the posterior forearm?

Answer 1

Lateral epicondyle of the humerus

Question 2

Which nerve innervates the posterior forearm?

Answer 2

Radial nerve

Question 3

What are the superficial muscles of the posterior compartment of the forearm?

Answer 3

1. Extensor digitorum
2. Extensor digiti minimi
3. Extensor carpi ulnaris

Question 4

What are the deep muscles of the posterior compartment of the forearm?

Answer 4

1. Supinator
2. Abductor pollicis longus
3. Extensor pollicis longus
4. Extensor pollicis brevis
5. Extensor indicis

Question 5

What borders the anatomical snuff box?

Answer 5

Extensor pollicis longus

Extensor pollicis brevis

Question 6

Which muscles make up the mobile wad?

Answer 6

1. Brachioradialis
2. Extensor carpi radialis longus
3. Extensor carpi radialis brevis

Question 7

What is the blood supply to the superficial and deep extensors?

Answer 7

Posterior interosseus artery

from the common interosseus artery

Question 8

What are the superficial muscles of the anterior compartment of the forearm?

Answer 8

1. Pronator teres
2. Flexor carpi radialis
3. Palmaris longus
4. Flexor carpi ulnaris

Question 9

Which nerve passes through the carpal tunnel?

Answer 9

Median nerve

Question 10

Which nerve enters the hand passing though the Guyon canal (between hook of hamate and pisiform)?

Answer 10

Ulnar nerve

Question 11

What are the deep muscles of the anterior compartment?

Answer 11

1. Flexor digitorum profundus
2. Flexor pollicis longus
3. Pronator quadratus

Question 12

Which two nerves innervate the anterior compartment of the forearm?

Answer 12

Median nerve

Ulnar nerve

Question 13

What is the blood supply to the anterior compartment of the forearm?

Answer 13

Radial artery

Ulnar artery

Question 14

What is the venous drainage of the anterior compartment of the arm?

Answer 14

Superficial and deep venous palmar arches –> Cephalic vein –> median cubital vein

Question 15

Which bones are involved in the wrist joint?

Answer 15

Radius
Lunate
Scaphoid
Triquetrum

Question 16

Is the wrist better at performing adduction or abduction?

Answer 16

Adduction

Question 17

Which muscles are involved in abduction of the wrist?

Answer 17

Flexor carpi radialis

Extensor carpi radialis longus and brevis

Question 18

Which muscles are involved in adduction of the wrist?

Answer 18

Extensor carpi ulnaris

Flexor carpi ulnaris

Question 19

What are the contents of the carpal tunnel?

Answer 19

Flexor digitorum superficialis (4)
Flexor digitorum profundus (4)
Flexor pollicis longus
Median nerve

Question 20

What is a Colles’ fracture of the wrist?

Answer 20

Distal radial fracture

Question 21

Which is the most frequently fractured carpal bone and how does this injury occur?

Answer 21

Scaphoid

Fall on outstretched palm

Question 22

What is an associated complication of a scaphoid fracture?

Answer 22

Damage to the radial artery

Question 23

What is a common cause of carpal tunnel syndrome?

Answer 23

Inflammation of synovial sheaths

Question 24

What occurs during carpal tunnel syndrome?

Answer 24

Compression of median nerve

Question 25

How is carpal tunnel syndrome treated?

Answer 25

Surgical division of flexor retinaculum to relieve compression