W9 - Deep EXTENSOR Muscles Of The Wrist

Question 1

Name the five muscles that make up the deep compartment of the extensor muscles of the wrist

Answer 1

Supinator
Abductor pollicis brevis
Extensor pollicis brevis
Extensor pollicis longus
Extensor indicis

Question 2

What nerve supplies? Supinator muscle

Answer 2

Posterior interosseous nerve C6 to 7

Question 3

What nerve supplies the whole of the deep compartment apart from the supinator muscle

Answer 3

Posterior interosseous nerve C-8

Question 4

Name the proximal and distal attachment sites for the supinator muscle

Answer 4

Proximal
Superficial lay : lateral epicondyle of humorous, radio collateral and anular ligaments
Player : supinator crest of the ulna

Distal
Lateral surface of radius superior to the anterior oblique line

Question 5

The proximal and distal attachment sites for the abductor pollicis brevis muscle

Answer 5

Proximal
Posterior upper ulnar and mid radius and adjacent interosseous membrane

Distal
Radio side of base of metacarpal one

Question 6

What action is the abductor pollicis brevis muscle responsible for

Answer 6

Assist extension and abduction of the first carpo joint
Abduct the wrist

Question 7

The proximal and distal attachment sites for the extensor pollicis brevis muscle

Answer 7

Proximal
Posterior surface of the ulnar and adjacent interosseous membrane

Distal
Dorsal surface of the base of the proximal phalanx of the thumb

Question 8

What action is the extensor pollicis brevis muscle responsible for

Answer 8

Extension of the MCP and CMC joint of the thumb

Question 9

Name the proximal distal attachment sites for the extensor pollicis longus muscle

Answer 9

Proximal
Posterior surface of the middle, third of the ulnar and adjacent interosseous membrane

Distal
Dorsal surface of the base of the distal phalanx of the thumb

Question 10

What action is the extensor pollicis longus muscle responsible for

Answer 10

Extension of the IP joint and assists extension of the MCP, CMC and wrist joint

Question 11

Attachment sites for the extensor indicis muscle

Answer 11

Proximal
Posterior surface on the distal ulna and adjacent interosseous membrane

Distal
Dorsal digital expansion of the index finger

Question 12

What action is the extensor indicis muscle responsible for?

Answer 12

Extension of the IP and MCP joint of the index finger