Upper Limb Nerves

Question 1

Axillary nerve roots

Answer 1

C5-6

Question 2

Axillary nerve sensory function

Answer 2

lower deltoid “regimental badge area”

Question 3

Where does the axillary nerve exit the axilla?

Answer 3

Posteriorly via the quadrangular space

Question 4

Which muscles are innervated by the axillary nerve?

Answer 4

Teres minor

Deltoid

Question 5

Musculocutaneous nerve roots

Answer 5

C5-C7

Question 6

Muculocutaeous nerve sensory function

Answer 6

Gives rise to lateral cutaneous nerve - innervates skin on lateral surface of forearm.

Question 7

Musculocutaneous nerve motor function

Answer 7

“BBC”

Biceps, brachialis, coracobrachialis

Question 8

Which cord of the brachial plexus does the MCN arise from?

Answer 8

Lateral cord

Question 9

Which muscles does the MCN travel between?

Answer 9

Anterior to brachialis, deep to biceps

Question 10

Which nerve roots form the median nerve?

Answer 10

C5-T1

Question 11

Median nerve motor function

Answer 11

Flexors of anterior forearm, except FCU and medial half of FDP.
Thenar eminence.
Lateral 2 lumbricals

Question 12

Median nerve sensory function

Answer 12

Palmar cutaneous branch: lateral palm

Digital cutaneous branch: lateral 3 1/2 digits on palmar surface

Question 13

What is carpal tunnel syndrome?

Answer 13

Compression of the median nerve within the carpal tunnel

Question 14

What type of fracture risks the median nerve?

Answer 14

Supracondylar

Question 15

Which cords make up the median nerve?

Answer 15

Medial and lateral

Question 16

Radial nerve roots

Answer 16

C5-T1

Question 17

Radial nerve sensory function

Answer 17

Skin of posterior forearm, dorsal palm (lateral side and lateral 3 1/2 digits)

Question 18

Radial nerve motor function

Answer 18

Triceps

Extensor muscles in forearm

Question 19

Which cord does the radial nerve arise from?

Answer 19

Posterior

Question 20

How does the radial nerve descend the arm?

Answer 20

Along the radial groove of the humerus

Question 21

Ulnar nerve roots

Answer 21

C8-T1

Question 22

Ulnar nerve motor function

Answer 22

Intrinsic hand muscles except thenar eminence and lateral lumbricals. FCU, medial half of FDP

Question 23

Ulnar nerve sensory function

Answer 23

Anterior and posterior one and a half fingers and associated palm area

Question 24

Which cord does the ulnar nerve arise from?

Answer 24

Medial cord

Question 25

Where does the ulnar nerve pass at the elbow?

Answer 25

Posterior to the medial epicondye

Question 26

How does the ulnar nerve enter the hand?

Answer 26

Superficial to flexor retinaculum, within ulnar canal