Forearm Extensors

Question 1

Extensor digitorum - origin

Answer 1

Lateral epicondyle of humerus via. Common extensor tendon

Question 2

Extensor Digitorum - insertion

Answer 2

Posterior surface of middle and distal phalanges of fingers 2-5 via. Dorsal digital expansion

Question 3

Extensor digitorum - actions

Answer 3

1. Extension of fingers 2-5 at MCP, PIP and DIP joints
2. Extension of hand at wrist joint
3. Medial rotation of pinky at CMC joint
4. Extension of forearm at elbow joint

Question 4

Extensor digitorum - innervation

Answer 4

Radial nerve

Question 5

Extensor digitorum - arterial supply

Answer 5

Posterior interosseous artery

Question 6

Extensor digiti minimi - origin

Answer 6

Lateral epicondyle of humerus via. Common extensor tendon

Question 7

Extensor digiti minimi - insertion

Answer 7

Ulnar side of tendon of ED to posterior surface of middle and distal phalanges of pinky via dorsal digital expansion

Question 8

Extensor digiti minimi - actions

Answer 8

1. Extension of pinky at MCP, PIP and DIP joints
2. Extension of hand at wrist joint
3. Ulnar deviation of hand at wrist joint
4. Medial rotation of pinky at CMC joint
5. Extension of forearm at elbow joint

Question 9

Extensor digiti minimi - innervation

Answer 9

Radial nerve

Question 10

Extensor digiti minimi - arterial supply

Answer 10

Posterior interosseous artery