Extensor Pollicis Longus

Question 1

Extensor Pollicis Longus (ORIGIN)

Answer 1

Posterior surface of the middle third of the ulna and interosseous membrane

Question 2

Extensor Pollicis Longus (INSERTION)

Answer 2

Base of the distal phalanx of the thumb

Question 3

Extensor Pollicis Longus (INNERVATION)

Answer 3

Radial nerve (posterior interosseous nerve, C7, C8)

Question 4

Extensor Pollicis Longus (BLOOD SUPPLY)

Answer 4

Posterior interosseous artery

Question 5

Extensor Pollicis Longus (ACTION)

Answer 5

Extends the distal phalanx of the thumb at the interphalangeal joint; extends the metacarpophalangeal and carpometacarpal joints