Posterior Forearm Deep Layer

Question 1

Adbuctor Pollicis Longus: O

Answer 1

Posterior aspect of Ulna, Radius and Interosseous Membrane

Question 2

Adbuctor Pollicis Longus: I

Answer 2

Base of 1st metacarpal

Question 3

Adbuctor Pollicis Longus: N

Answer 3

Posterior Interosseous Nerve C7-8 (continuation of Deep branch of Radial Nerve)

Question 4

Adbuctor Pollicis Longus: A

Answer 4

Abducts Thumb and extends it at Carpometacarpal joint

Question 5

Extensor Pollicis Brevis: O

Answer 5

Posterior of Radius and Interosseous Membrane

Question 6

Extensor Pollicis Brevis: I

Answer 6

Base of proximal Phalanx of Thumb

Question 7

Extensor Pollicis Brevis: N

Answer 7

Posterior Interosseous Nerve C7-8 (continuation of Deep branch of Radial Nerve)

Question 8

Extensor Pollicis Brevis: A

Answer 8

Extends proximal Phalanx of Thumb at Carpometacarpal joint

Question 9

Extensor Pollicis Longus: O

Answer 9

Posterior middle 1/3 of Ulna and Interosseous membrane

Question 10

Extensor Pollicis Longus: I

Answer 10

Base of distal phalanx of Thumb

Question 11

Extensor Pollicis Longus : N

Answer 11

Posterior Interosseous Nerve C7-8 (continuation of Deep branch of Radial Nerve)

Question 12

Extensor Pollicis Longus: A

Answer 12

Extends distal Phalanx of Thumb at Metacarpophalangeal and Interphalangeal joints

Question 13

Extensor Indicis: O

Answer 13

Posterior aspect of Ulna and Interosseous Membrane

Question 14

Extensor Indicis: I

Answer 14

Extensor expansion of 2nd digit

Question 15

Extensor Indicis: N

Answer 15

Posterior Interosseous Nerve C7-8 (continuation of Deep branch of Radial Nerve)

Question 16

Extensor Indicis: A

Answer 16

• Extends 2nd digit

- Helps extend hand

Question 17

Supinator: O

Answer 17

Lateral Epicondyle of Humerus, Radial Collateral and Annular Ligaments, Supinator Fossa, and Crest of Ulna

Question 18

Supinator: I

Answer 18

Lateral, posterior and anterior aspects of proximal 1/3 of radius

Question 19

Supinator: N

Answer 19

Deep branch of Radial Nerve C5-6

Question 20

Supinator: A

Answer 20

Supinates forearm (rotates Radius to turn palm anteriorly)