The Wrist Joint and Bones of the Hand

Question 1

How many carpal bones are there

Answer 1

8

Question 2

In the proximal row (lateral to medial)

Answer 2

Scaphoid
Lunate
Triquetrum
Pisiform

Question 3

Pisifrom

Answer 3

A sesamoid bone, formed within the tendon of the flexor carpi ulnaris

Question 4

In the distal row (lateral to medial)

Answer 4

Trapezium
Trapezoid
Capitate
Hamate

Question 5

Distal articulating surface of the wrist joint

Answer 5

The proximal row of the carpal bones (except from the pisiform bone

Question 6

Proximal articulating surface of the wrist joint

Answer 6

The distal end of the radius, and the articular disk

Question 7

Joint capsule

Answer 7

The fibrous outer layer attaches to the radius, ulna and the proximal row of the carpal bones. The internal layer is comprised of a synovial membrane, secreting synovial fluid which lubricates the joint

Question 8

Palmar Radiocarpal Ligament

Answer 8

It is found on the palmar (anterior) side of the hand. It passes from the radius to both rows of carpal bones. Its function, apart from increasing stability, is to ensure that the hand follows the forearm during supination.

Question 9

Dorsal Radiocarpal Ligament

Answer 9

It is found on the dorsum (posterior) side of the hand. It passes from the radius to both rows of carpal bones. It contributes to the stability of the wrist, but also ensures that the hand follows the forearm during pronation

Question 10

Ulnar Collateral Ligament

Answer 10

Runs from the ulnar styloid process to the triquetrum and pisiform. Works in union with the other collateral ligament to prevent excessive lateral joint displacement.

Question 11

Radial Collateral Ligament

Answer 11

Runs from the radial styloid process to the scaphoid and trapezium. Works in union with the other collateral ligament to prevent excessive lateral joint displacement

Question 12

What type of joint is the wrist joint

Answer 12

A synovial Condyloif

Question 13

Flexion of the Wrist

Answer 13

flexor carpi ulnaris, flexor carpi radialis, with assistance from the flexor digitorum superficialis

Question 14

Extension of the Wrist

Answer 14

extensor carpi radialis longus and brevis, and extensor carpi ulnaris, with assistance from the extensor digitorum

Question 15

Adduction of the Wrist

Answer 15

extensor carpi ulnaris and flexor carpi ulnaris

Question 16

Abduction of the Wrist

Answer 16

abductor pollicis longus, flexor carpi radialis, extensor carpi radialis longus and brevis.