Deep Forearm Extensors

Question 1

Abductor Pollicis Longus

Answer 1

O: Posterior Ulna and Radius

I: Base of the 1st Metacarpal

A: Abducts and Extends the Thumb

N: Radial Nerve (C7-8)

Question 2

Extensor Indicis

Answer 2

O: Posterior Ulna

I: Extensor Digitorum Tendon to Index Finger

A: Extends Index Finger

N: Radial Nerve (C7-8)

Question 3

Extensor Pollicis Brevis

Answer 3

O: Posterior Radius

I: Proximal Phalanx of the Thumb

A: Extends Proximal Phalanx of the Thumb

N: Radial Nerve (C7-8)

Question 4

Extensor Pollicis Longus

Answer 4

O: Middle 1/3 of the Posterior Ulna

I: Distal Phalanx of the Thumb

A: Extends Distal and Proximal Phalanx of the Thumb

N: Radial Nerve (C7-8)

Question 5

Supinator

Answer 5

O: Common Extensor Tendon, Annular Ligament

I: Proximal Shaft of the Radius

A: Supination

N: Radial Nerve (C5-6)