lecture 25 - upper limb nerves

Question 1

What are the 2 nerves that branch from the brachial plexus at the root level?

Answer 1

Dorsal scapular nerve, long thoracic nerve

Question 2

What nerve supplies the rhomboids and levator scapulae?

Answer 2

Dorsal scapular nerve

Question 3

What nerve supplies serratus anterior?

Answer 3

Long thoracic nerve

Question 4

What is the path of the axillary artery?

Answer 4

Posterior cord of brachial plexus, winds around surgical neck of humerus, supplies muscles and skin

Question 5

What muscles does the axillary nerve supply?

Answer 5

Deltoid, teres minor

Question 6

What area has cutaneous innervation by the axillary artery?

Answer 6

Upper lateral skin of the arm

Question 7

What compartment of the arm does the radial nerve lie in?

Answer 7

Posterior compartment

Question 8

What is the path of the radial nerve?

Answer 8

Posterior cord of brachial plexus, posterior compartment of arm, radial groove of humerus, passes lateral epicondyle, forearm, hand

Question 9

What does the radial nerve supply in the arm?

Answer 9

Triceps brachii muscle

Question 10

What nerve does the radial nerve give off in the forearm?

Answer 10

Posterior interosseous nerve

Question 11

What does the posterior interosseous nerve (branch of radial nerve) of the forearm supply?

Answer 11

Supinator and posterior forearm compartment arm muscles

Question 12

What area of the hand has cutaneous innervation by the radial artery?

Answer 12

Skin on lateral, dorsal 3 1/2 fingers (excluding nailbeds)

Question 13

What nerve provides sensory innervation to the posterior arm and forearm?

Answer 13

Radial nerve

Question 14

What areas have cutaneous innervation by the radial nerve?

Answer 14

skin on lateral, dorsal 3 1/2 fingers, posterior forearm, lateral/posterior arm

Question 15

What is the path of the musculocutaenous nerve?

Answer 15

lateral cord of brachial plexus, arm, forearm, branch into lateral cutaneous nerve

Question 16

What areas have cutaneous innervation by the musculocutaneous nerve?

Answer 16

Skin on lateral side of forearm (via lateral cutaneous nerve branch)

Question 17

What nerve supplies the skin of the lateral forearm?

Answer 17

lateral cutaneous nerve, a branch of the musculocutaneous nerve

Question 18

What muscles does the musculocutaenous nerve supply?

Answer 18

Anterior compartment of the arm muscles: biceps brachii, coracobrachialis, brachialis

Question 19

What nerve supplies the muscles of the anterior compartment of the forearm?

Answer 19

Musculocutaneous nerve

Question 20

What does the ulnar nerve supply in the arm?

Answer 20

Nothing - only supplies forearm and hand

Question 21

What muscles does the ulnar nerve supply in the forearm?

Answer 21

Flexor carpi ulnaris, medial half of flexor digitiorum profundus

Question 22

What nerve supplies flexor carpi ulnaris?

Answer 22

Ulnar nerve

Question 23

What are the 3 key distal branches of the ulnar nerve that supply different parts of the hand?

Answer 23

Superficial branch, deep branch, dorsal branch

Question 24

What does the superficial branch of the ulnar nerve supply?

Answer 24

Skin of medial, palmar 1 1/2 fingers

Question 25

What does the deep branch of the ulnar nerve supply?

Answer 25

Hypothenar muscles, adductor pollicis, interossei, medial 2 lumbricals

Question 26

What does the dorsal branch of the ulnar artery supply?

Answer 26

Skin of medial, dorsal 1 & 1/2 fingers

Question 27

What branch of the ulnar artery supplies intrinsic muscles of the hand?

Answer 27

Deep branch

Question 28

What artery does the median nerve rung alongside within the arm ?

Answer 28

Brachial artery

Question 29

What does the median nerve supply in the arm?

Answer 29

Nothing, just runs through

Question 30

What muscles does the median nerve supply in the forearm?

Answer 30

Anterior compartment muscles, except flexor carpi ulnaris and lateral half of flexor digitorum profundus, which are supplied by the ulnar nerve

Question 31

What structure does the median nerve pass through from forearm to hand?

Answer 31

Carpal tunnel

Question 32

What skin does the median nerve supply in the hand?

Answer 32

Skin of palmar, lateral 3 1/2 fingers and palm/thumb, and dorsal side of distal phalanges (nail beds) of these fingers,

Question 33

What are the 3 key nerves that pass over the elbow joint?

Answer 33

Ulnar nerve, median nerve, radial nerve

Question 34

What is the dermatome of the medial arm?

Answer 34

T1

Question 35

What is the dermatome of the pinkie finger?

Answer 35

C8

Question 36

What is the dermatome of the middle 3 fingers?

Answer 36

C7

Question 37

What is the dermatome of the thumb?

Answer 37

C6

Question 38

What is the dermatome of the lateral arm?

Answer 38

C5

Question 39

Where will there be sensory loss if the radial nerve is damaged?

Answer 39

At the skin of lateral 3 1/2 fingers on the dorsal side

Question 40

What distint hand position occurs when there is damage to the ulnar artery?

Answer 40

‘Clawed hand’

Question 41

How are the thenar muscles affected in a median nerve injury?

Answer 41

Loss of coordination/strength of the thumb, unable to oppose thumb, wasting of thenar eminence

Question 42

What distinct hand position occurs in patients with median nerve injury?

Answer 42

‘hands of benediction’

Question 43

What artery supplies the anterior compartment of the arm?

Answer 43

Brachial artery

Question 44

What artery supplies the posterior compartment of the arm?

Answer 44

Deep brachial artery

Question 45

What artery supplies the superifical anterior compartment of the forearm?

Answer 45

Ulnar and radial arteries, anterior interosseous artery

Question 46

What artery supplies the deep anterior compartment of the forearm?

Answer 46

Ulnar and radial arteries

Question 47

What artery supplies the hand?

Answer 47

Radial and ulnar arteries via the superficial and deep palmar arches

Question 48

What nerve innervates the anterior compartment of the arm?

Answer 48

Musculocutaneous nerve

Question 49

What nerve innervates the posterior compartment of the arm?

Answer 49

Radial nerve

Question 50

What nerves innervate the anterior compartment of the arm?

Answer 50

Median nerve, ulnar nerve

Question 51

What artery supplies the posterior compartment of the forearm?

Answer 51

Posterior interosseous artery

Question 52

What nerve innervates the hand?

Answer 52

Median nerve, ulnar nerve