Extensors

Question 1

Extensor digitorum

Origin

Insertion

Answer 1

Origin:

• Lateral epicondyle (common extensor tendon)

Insertion:

• Middle and distal phalanges of D2-5

Question 2

Extensor digitorum

Action

Innervation

Answer 2

Action:

• Hand, wrist, finger extension

Innervation:

• Posterior IO n. (from radial n.)

Question 3

Extensor carpi radialis longus

Origin

Insertion

Answer 3

Origin:

• Common extensor tendon

Insertion:

• Base of M2

Question 4

Extensor carpi radialis longus

Action

Innervation

Answer 4

Action:

• Wrist extension
• Abduction

Innervation:

• Radial n.

Question 5

Extensor carpi radialis brevis

Origin

Insertion

Answer 5

Origin:

• Common extensor tendon

Insertion:

• Base of M3

Question 6

Extensor carpi radialis brevis

Action

Innervation

Answer 6

Action:

• Wrist extension
• Abduction

Innervation:

• Posterior IO n. (from radial n.)

Question 7

Extensor carpi ulnaris

Origin

Insertion

Answer 7

Origin:

• Common extensor tendon
• Ulna

Insertion:

• Base of M5

Question 8

Extensor carpi ulnaris

Action

Innervation

Answer 8

Action:

• Wrist extension
• Adduction

Innervation:

• Posterior IO n. (from radial n.)

Question 9

Extensor digiti minimi

Origin

Insertion

Answer 9

Origin:

• Common extensor tendon

Insertion:

• Extensor expansion at base of proximal phalanx on D5

Question 10

Extensor digiti minimi

Action

Innervation

Answer 10

Action:

• Wrist/D5 extension

Innervation:

• Posterior IO n. (from radial n.)

Question 11

Extensor Indicis

Origin

Insertion

Answer 11

Origin:

• Distal ulna and IO membrane

Insertion:

• Base of proximal phalanx of D2

Question 12

Extensor Indicis

Action

Innervation

Answer 12

Action:

• Wrist/D2 extension

Innervation:

• Posterior IO n. (from radial n.)