Muscles of the Snuff-Box

Question 1

Posterior surface of proximal half of ulna, radius and interosseous membrane

Answer 1

Extensor Pollicis Longus Origin

Question 2

Base of first metacarpal

Answer 2

Extensor Pollicis Longus Insertion

Question 3

Abducts Thumb Extends thumb at the carpometacarpal joint

Answer 3

Extensor Pollicis Longus Action

Question 4

Posterior Interosseous Artery (2)

Answer 4

Extensor Pollicis Longus Blood

Extensor Pollicis Brevis Blood

Question 5

Posterior Interosseous Nerve (3)

Answer 5

Extensor Pollicis Longus Innervation

Extensor Pollicis Brevis

Abductor Pollicis Longus

Question 6

Posterior surface of distal 1/3 of radius and interosseous membrane

Answer 6

Extensor Pollicis Brevis Origin

Question 7

Dorsum of proximal phalanx of thumb

Answer 7

Extensor Pollicis Brevis Insertion

Question 8

Extends proximal phalanx of thumb

Answer 8

Extensor Pollicis Brevis Actions

Question 9

Posterior surface of middle 1/3 of ulna and interosseous membrane

Answer 9

Abductor Pollicis Longus Origin

Question 10

Dorsal aspect of base of distal phalanx of thumb

Answer 10

Abductor Pollicis Longus Insertion

Question 11

• Extends distal phalanx of thumb at its IP joint - Extends the metacarpophalangeal and carpometacarpal joint

Answer 11

Abductor Pollicis Longus Action

Question 12

Posterior interosseous Artery

Anterior Interosseous Arteries

Answer 12

Abductor Pollicis Longus Blood