Ulnar nerve

Question 1

What does the ulnar nerve do after it leaves the axilla?

Answer 1

Descends down arm

Question 2

How does the ulnar nerve descend down the arm?

Answer 2

Medial side of arm

Question 3

What does the ulnar nerve do at the end of the arm?

Answer 3

Passes posterior to medial epicondyle

Question 4

What does the ulnar nerve do once it’s entered the forearm?

Answer 4

Travels between two heads of flexor carpi ulnaris

Question 5

What does the ulnar nerve do in the forearm?

Answer 5

Gives off branches

supply muscles

Question 6

What does the ulnar nerve do at the end of the forearm?

Answer 6

Gives off branches
Palmar cutaneous branch of ulnar nerve

Dorsal cutaneous nerve branch of ulnar nerve

Question 7

How does the ulnar nerve enter the hand from the forearm?

Answer 7

Anterior to flexor retinaculum

Through Guyon’s canal

Question 8

What does the ulnar nerve do in the hand?

Answer 8

Divides into superficial branch of ulnar nerve

deep branch of ulnar nerve

Question 9

What are the motor functions of the ulnar nerve?

Answer 9

Ulnar nerve supplies

• flexor carpi ulnaris
• medial half of FDP

Deep branch of ulnar nerve supplies

• flexor digiti minimi
• abductor digiti minimi
• opponens digiti minimi
• medial two lumbricals
• interossei - palmar and dorsal
• adductor pollicis
• palmaris brevis

Question 10

What are the sensory functions of the ulnar nerve?

Answer 10

Palmar cutaneous branch
innervates medial palmar surface beneath medial 1.5 fingers

Dorsal cutaneous branch
innervates dorsal surface of medial 1.5 fingers
and area below them

Superficial branch of ulnar nerve
innervates palmar surface of medial 1.5 fingers