Brachial Plexus Part 4

Question 1

T/F: the superficial branch of the radial nerve penetrates the supinator muscle, gives off a series of branches to supply posterior forearm muscles before terminating.

Answer 1

False; this is true of the deep branch

Question 2

What does the deep branch of the radial nerve terminate as?

Answer 2

posterior interosseous nerve

Question 3

Which surface of the hand does the superficial branch of the radial nerve travel to ultimately?

Answer 3

the posterior surface

Question 4

What muscle does the superficial branch of the radial nerve travel with?

Answer 4

brachioradialis

Question 5

What branch of the radial nerve comes off in the upper arm to supply the skin on the posterior side of the upper arm?

Answer 5

posterior cutaneous nerve of the arm

Question 6

Where does the inferior lateral cutaneous nerve of the arm branch off of the radial nerve?

Answer 6

in the middle arm

Question 7

What muscles are supplied by the branches given off of the radial nerve in the arm?

Answer 7

triceps brachii (all 3 heads) and the anconeus (by way of a branch off the branch to the medial head of the triceps brachii)

Question 8

What nerve comes off of the radial nerve in the upper arm to supply a narrow area of skin on the lateral side of the posterior arm?

Answer 8

posterior cutaneous nerve of the forearm

Question 9

What muscles are supplied by branches given off of the radial nerve at the level of the lateral epicondyle?

Answer 9

brachioradialis and extensor carpi radialis longus

Question 10

What does the radial nerve split into once in the forearm?

Answer 10

deep and superficial branches

Question 11

What does the superficial branch of the radial nerve give off after traveling to the hand?

Answer 11

dorsal digital nerves

Question 12

Which branch of the radial nerve supplies sensory info to the radial side of the posterior hand?

Answer 12

superficial branch

Question 13

Which branch of the radial nerve provides sensory info to the extensor side of the thumb?

Answer 13

superficial branch

Question 14

What nerve provides sensory info to the the extensor side of the proximal phalanges of digits 2 and 3 as well as the lateral half of the extensor side of the ring finger?

Answer 14

superficial branch of the radial nerve

Question 15

which branch of the radial nerve gives off the communicating branch with the ulnar nerve?

Answer 15

superficial branch

Question 16

What does forearm muscles are supplied by the deep branch of the radial nerve?

Answer 16

extensor carpi radialis brevis, supinator, extensor digitorum, extensor digiti minimi, extensor carpi ulnaris, abductor pollicis longus, and extensor pollicis brevis
(basically everything on the back of the forearm)

Question 17

T/F: abductor pollicis longus is a thenar muscle.

Answer 17

false

Question 18

What is the terminal branch of the deep branch of the radial nerve?

Answer 18

posterior interosseous nerve

Question 19

What does the posterior interosseous nerve supply?

Answer 19

extensor pollicis longus and extensor indicis

Question 20

T/F: the radial nerve sends articular branches to the elbow joint.

Answer 20

False; only sends articular branches to the shoulder and wrist

Question 21

What two reflexes associated with the radial nerve typically occur at the same time? (clinical consideration)

Answer 21

brachioradialis and triceps reflexes

Question 22

What nerve is wrist drop typically associated with?

Answer 22

radial nerve

Question 23

What brachial plexus injury is associated with C5/C6 roots, birth trauma, “waiter’s tip” posture, and Erb’s Palsy?

Answer 23

Erb-Duchenne

Question 24

What brachial plexus injury typically involves the suprascapular, axillary, and/or musculocutaneous nerves?

Answer 24

Erb-Duchenne

Question 25

What brachial plexus injury involves C8/T1 roots, birth trauma or overhead injury (falling and catching self on tree limb), and results in weak hand muscles?

Answer 25

Klumpke

Question 26

What is another name for Klumpke?

Answer 26

Klumpke palsy or Dejerine-Klumpke palsy

Question 27

If a person suffering from Klumpke palsy has T1 involvement what other condition may be present?

Answer 27

Horner’s syndrome -> ptosis and miosis