Wrist and Hand

Question 1

5 extrinsic wrist flexors

Answer 1

 Flexor carpi radialis
 Flexor carpi ulnaris
 Palmaris longus
 Flexor digitorum superficialis
 Flexor digitorum profundus

Question 2

Concentric actions of the flexor carpi radialis

Answer 2

Wrist flexion and wrist radial deviation

Question 3

Concentric actions of the flexor carpi ulnaris

Answer 3

Wrist flexion and ulnar deviation

Question 4

Concentric action of the palmaris longus

Answer 4

Wrist flexion

Question 5

Concentric actions of the flexor digitorum superficialis

Answer 5

• Wrist flexion
• 2nd – 5th finger MCP flexion
• 2nd – 5th finger PIP flexion

Question 6

Concentric actions of the flexor digitorum profundus

Answer 6

• Wrist flexion
• 2nd – 5th MCP flexion
• 2nd – 5th PIP flexion
• 2nd – 5th DIP flexion

Question 7

6 extrinsic wrist extensors

Answer 7

 Extensor carpi radialis longus
 Extensor carpi radialis brevis
 Extensor carpi ulnaris
 Extensor digitorum
 Extensor digiti minimi
 Extensor indicis

Question 8

Concentric action of the extensor carpi radialis longus

Answer 8

• Wrist extension
• Wrist radial deviation

Question 9

Primary concentric action of the extensor carpi radialis brevis

Answer 9

Wrist extension
Wrist radial deviation

Question 10

Primary concentric actions of the extensor carpi ulnaris

Answer 10

Wrist extension
Ulnar deviation

Question 11

Primary concentric actions of the extensor digitorum

Answer 11

Wrist extension
2nd – 5th MCP extension
* 2nd – 5th PIP extension
* 2nd – 5th DIP extension

Question 12

Concentric actions of the extensor digiti minimi

Answer 12

Wrist extension
5th MCP extension

Question 13

Concentric actions of the extensor indicis

Answer 13

Wrist extension
2nd MCP extension

Question 14

Concentric actions of the dorsal interossei

Answer 14

Abduction of MCP of 2nd-4th MCP digits

Question 15

Concentric action of the abductor digiti minimi

Answer 15

Abduction of MCP of 5th finger

Question 16

Concentric action of the palmar interossei

Answer 16

Adduction of MCP 2nd, 4th, 5th fingers

Question 17

Concentric actions of the extensor pollicis longus

Answer 17

• 1st CMC extension
• 1st MCP extension
• 1st IP extension

Question 18

Concentric actions of the extensor pollicis brevis

Answer 18

• 1st CMC extension
• 1st MCP extension

Question 19

Concentric actions of the abductor pollicis longus

Answer 19

• 1st CMC abduction
• 1st CMC extension

Question 20

Concentric actions of the flexor pollicis longus

Answer 20

• 1st CMC flexion
• 1st MCP flexion
• 1st IP flexion

Question 21

Concentric actions of the adductor policis

Answer 21

1st CMC adduction

Question 22

What are the tendons/bones that make up the anatomical snuff box, and what movement is required to see it?

Answer 22

Thumb extension
Medial (ulnar) border = Extensor pollicis longus tendon,
Lateral (radial) border - extensor pollicis brevis & abductor pollicis longus tendons
Floor = scaphoid

Question 23

How is the carpal tunnel formed?

Answer 23

The flexor retinaculum (transverse carpal ligament) forms a bridge over the carpal
bones which forms the carpal tunnel

Question 24

What is the contents of the carpal tunnel?

Answer 24

Flexor muscle tendons (9 tendons in total) and the median nerve travel
through the tunnel
* Median nerve
* 4 tendons of the flexor digitorum superficialis
* 4 tendons of the flexor digitorum profundus
* Flexor pollicis longus tendon

Question 25

What 3 muscles make up the thenar eminence

Answer 25

• Abductor pollicis brevis
• Flexor pollicis brevis
• Opponens pollicis

Question 26

What 3 muscles make up the hypothenar eminence

Answer 26

Abductor digiti minimi
Flexor digiti minimi brevisOpponens digiti minimi