Posterior Upper Limb Muscles

Question 1

What are the posterior upper limb muscles?

Answer 1

• Triceps brachii
• Extensor carpi ulnaris
• Extensor digitorum
• Extensor carpi radialis brevis
• Extensor carpi radialis longus

Question 2

What are the movements of triceps brachii?

Answer 2

• Adduction of arm and shoulder joint

- Extension of elbow joint and forearm

Question 3

What are the attachments of triceps brachii?

Answer 3

• Origin: body of humerus

- Inserts: olecranon and ulna

Question 4

What are the movements extensor carpi ulnaris?

Answer 4

• Adduction and extension of hand and wrist joint

Question 5

What are the attachments of extensor carpi ulnaris?

Answer 5

• Origin: lateral epicondyle of humerus and posterior surface of ulna
• Inserts: base of 5th metacarpal bone

Question 6

What are the movements of extensor digitorum?

Answer 6

• Extension of fingers 2-5

Question 7

What are the attachments of extensor digitorum?

Answer 7

• Origin: lateral epicondyle of humerus

- Insert: extensor expansions of digits 2-5

Question 8

What are the movements of extensor carpi radialis brevis?

Answer 8

• Abduction and extension of hand and wrist joint

Question 9

What are the attachments of extensor carpi radialis brevis?

Answer 9

• Origin: lateral epicondyle of humerus

- Inserts: base of 3rd metacarpal bone

Question 10

What are the movements of extensor carpi radialis longus?

Answer 10

• Abduction and extension of hand and wrist joint

Question 11

What are the attachments of extensor carpi radialis longus?

Answer 11

• Origin: from lateral supracondylar ridge of humerus.

- Inserts: into base of 2nd metacarpal bone