4 The wrist and hand joints

Question 1

What is the wrist joint?

Answer 1

The radiocarpal joint

Question 2

What type of joint is the radiocarpal joint?

Answer 2

Synovial condyloid joint

Question 3

What forms the radiocarpal joint?

Answer 3

Proximally - distal end of radius and articular disk
Distally - proximal row of carpal bones except pisiform

Question 4

Is the ulnar part of the wrist joint?

Answer 4

No due to an articulating disk (fibrocartliaginous ligament) over superior surface of ulna

Question 5

What type of surface to carpal bones form?

Answer 5

Convex

Question 6

Does radiocarpal joint have a joint capsule?

Answer 6

Yes, two layers
Fibrous (outer) layer
Synovial membranous (internal) layer

Question 7

How many signifacnt radiocarpal joint ligaments are there?

Answer 7

4
Palmar radiocarpal
Dorsal radiocarpal
Ulnar collateral
Radial collateral

Question 8

Where is the palmar radiocarpal ligament?

Answer 8

Palmar (anterior) side of hand, from radius to both rows of carpal bones

Question 9

What is the purpose of the palmar radiocarpal ligament?

Answer 9

Increase stability of radiocarpal joint
Ensure hand follows forearm in supination

Question 10

Where is the dorsal radiocarpal ligament?

Answer 10

Dorsal (posterior) side of hand, from radius to both rows of carpal bones

Question 11

What is the purpose of the dorsal radiocarpal ligament?

Answer 11

Increase stability of radiocarpal joint
Ensure hand follows forearm in pronation

Question 12

Where is the ulnar collateral ligament?

Answer 12

From styloid process of ulna to triquetrim and pisiform

Question 13

Where is the radial collateral ligament?

Answer 13

From styloid process of radius to scaphoid and trapezium

Question 14

What is the purpose of the ulna collateral ligament?

Answer 14

With radial collateral ligament to prevent excessive lateral joint displacement

Question 15

What is the purpose of the radial collateral ligament?

Answer 15

With ulna collateral ligament to prevent excessive medial joint displacement

Question 16

Where does the radiocarpal recieve blood branches from?

Answer 16

Dorsal carpal arch
Palmar carpal arch
From radial and ulnar artery

Question 17

Which nerves are responsible movement of radiocarpal joint?

Answer 17

Posterior interosseus branch of radial nerve
Anterior interosseus branch of median nerve
Deep branch of ulnar nerve
Dorsal branch of ulnar nerve

Question 18

How many axes can the radiocarpal joint move in?

Answer 18

2
Flexion and extension
Abduction and adduction

Question 19

Which muscles produce flexion at radiocarpal joint?

Answer 19

Flexor carpi ulnaris
Flexor carpi radialis
Flexor digitorum superficialis (assists)

Question 20

Which muscles produce extension at radiocarpal joint?

Answer 20

Extensor carpi ulnaris
Extensor carpi radialis longus
Extensor carpi radialis brevis
Extensor digitorum (assists)

Question 21

Which muscles produce adduction at radiocarpal joint?

Answer 21

Extensor carpi ulnaris
Flexor carpi ulnaris

Question 22

Which muscles produce abduction at radiocarpal joint?

Answer 22

Extensor carpi radialis longus
Extensor carpi radialis brevis
Flexor carpi radialis

Question 23

What are the joints in the hand?

Answer 23

Metacarpophalangeal joints - MCP
Interphalangeal joints - IP
(proximal and distal)

Question 24

What type of joint is the MCP joint?

Answer 24

Synovial condyloid

Question 25

What type of joint are IP joints?

Answer 25

Synovial hinge

Question 26

What are the six movements of the hand?

Answer 26

Flexion of digits Extension of digits Abduction of digits Adduction of digits Opposition of thumb and little finger Reposition of thumb and little finger

Question 27

At which joints can flexion and extension of digits occur?

Answer 27

MCP PIP DIP

Question 28

What is the midline of the hand?

Answer 28

The middle finger