Brachial Plexus Part 3

Question 1

What cords contribute to the median nerve?

Answer 1

lateral and medial cord

Question 2

What cord levels contribute fibers to the median nerve?

Answer 2

C6-T1

Question 3

T/F: Just like the ulnar nerve, the median nerve travels through the arm in the medial bicipital sulcus and gives off no branches in the arm.

Answer 3

True

Question 4

What muscle heads does the median nerve travel between after crossing the elbow on the anterior side to enter the forearm?

Answer 4

passes between the two heads of the pronator teres

Question 5

What five muscles in the forearm are innervated by the median nerve?

Answer 5

pronator teres, flexor carpi radialis, palmaris longus, flexor digitorum superficialis, and pronator quadratus

Question 6

How does the median nerve innervate the pronator quadratus?

Answer 6

by way of the anterior interosseous nerve of the forearm which is given off the median nerve in the elbow

Question 7

Where is the palmar branch of the median nerve given off?

Answer 7

in the distal third of the forearm

Question 8

What supplies the skin of the thenar eminence, lateral wrist and palm?

Answer 8

palmar branch of the median nerve

Question 9

T/F: the median nerve passes through the carpal tunnel

Answer 9

True

Question 10

After passing through the carpal tunnel, what does the median nerve divide into?

Answer 10

three common palmar digital nerves

Question 11

What supplies the first two lumbricals of the hand?

Answer 11

common palmar digital nerve of the median nerve

Question 12

Which branch of the median nerve supplies the abductor pollicis brevis, flexor pollicis brevis (superficial head), and the opponens pollicis?

Answer 12

the first common palmar digital nerve

Question 13

T/F: in the hand, the thenar eminence and the first 2 lumbricals are the only muscles supplied by the median nerve.

Answer 13

true

Question 14

What does each common palmar digital nerve of the median nerve split into?

Answer 14

two proper palmar digital nerves

Question 15

What is supplied by the proper palmar digital nerve?

Answer 15

the skin over the lateral three and a half digits (sensory only)

Question 16

T/F: the median nerve supplies the periosteum of the forearm, the elbow, radiocarpal and midcarpal joints, and usually communicates with the ulnar nerve at the wrist.

Answer 16

True

Question 17

What clinical consideration of the median nerve involves only the 4th and 5th fingers closing when trying to make a fist?

Answer 17

hand of oath/benediction

Question 18

T/F: carpal tunnel syndrome is associated mostly with the ulnar nerve.

Answer 18

false; median nerve

Question 19

T/F: injury to the median nerve can lead to an inability to pronate.

Answer 19

True

Question 20

What branches are given off of the posterior cord?

Answer 20

superior subscapular nerve, thoracodorsal nerve, inferior subscapular nerve, axillary nerve, and the radial nerve

Question 21

T/F: the superior subscapular nerve, the inferior subscapular nerve and the axillary nerve all receive fibers from C5 and C6.

Answer 21

True

Question 22

T/F: the superior subscapular nerve supplies the subscapularis and the teres major.

Answer 22

False; this is true of the inferior subscaular nerve. The superior subscapular nerve only supplies the subscapularis

Question 23

What cord levels contribute to the thoracodorsal nerve?

Answer 23

C6, C7, and C8

Question 24

What nerve travels along the posterior axillary wall to supply the latissimus dorsi?

Answer 24

Thoracodorsal nerve

Question 25

What nerve travels posteriorly around the surgical neck of the humerus to supply the deltoid and teres minor muscles?

Answer 25

Axillary nerve

Question 26

What branch does the axillary nerve give off at the same level that the branch to the teres minor is given off? What does it supply?

Answer 26

superior lateral cutaneous nerve of the arm (sensory);

supplies skin over the lateral shoulder and upper arm

Question 27

What cord levels contribute fibers to the radial nerve?

Answer 27

C5-C8 and sometimes T1

Question 28

What nerve supplies all of the muscles in the posterior compartment of the arm and forearm?

Answer 28

radial nerve

Question 29

T/F: the radial nerve spirals around to the posterior of the humerus from the medial bicipital sulcus.

Answer 29

true

Question 30

The radial nerve passes into the forearm on the anterior side of the elbow after traveling between what two muscles?

Answer 30

brachialis and brachioradialis

Question 31

Where does the radial nerve split into superficial and deep branches?

Answer 31

at the level of the radial head