Brachial Plexus - Part 4

Question 1

The inferior subscapular nerve contains fibers from what?

Answer 1

C5 and C6

Question 2

The inferior subscapular nerve supplies what muscles?

Answer 2

Subscapularis (a rotator cuff)

Teres major

Question 3

What are the two terminal branches coming off of the posterior cord?

Answer 3

axillary nerve

Radial nerve

Question 4

The axillary nerve contains fibers from what?

Answer 4

C5 and C6

Question 5

The axillary nerve travels in the axilla then travels _______ around the ___________ of the ______.

Answer 5

Posteriorly
Surgical neck
humerus

Question 6

The axillary nerve supplies what two muscles?

Answer 6

Deltoid
Teres minor ( a rotator cuff)

Question 7

What sensory branch is given off of the axillary nerve at the same level that the branch to the teres minor is given off? (it then goes to deltoid)

Answer 7

Superior lateral cutaneous nerve of the arm

Question 8

The superior lateral cutaneous nerve of the arm supplies what?

Answer 8

Skin over the lateral shoulder and upper arm

Question 9

The radial nerve contains fibers from what?

Answer 9

C5-C8, and sometimes T1

Question 10

The radial nerve supplies all the muscles in which compartment of the arm?

Answer 10

posterior

Question 11

From the medial bicipital sulcus, the radial nerve spiral around to what?

Answer 11

Posterior of humerus

Question 12

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

Answer 12

Anterior
Elbow
Brachialis and brachioradialis

Question 13

In the forearm, the radial nerve divides into what?

Answer 13

Superficial and deep branch

Question 14

The superficial branch of the radialis follows what muscle to the distal 3rd of the forearm?

Answer 14

brachioradialis

Question 15

The superficial branch of the radialis travels between what to the posterior surface of the hand?

Answer 15

Brachioradialis and radius

Question 16

The deep branch of the radial nerve penetrates what muscle?

Answer 16

supinator

Question 17

The deep branch of the radial nerve gives off branches to supply what?

Answer 17

Posterior forearm muscles

Question 18

The deep branch of the radial nerve terminates as what nerve?

Answer 18

Posterior interosseous nerve

Question 19

What nerve off of the radial nerve branches off in the upper arm?

Answer 19

Posterior cutaneous nerve of the arm

Question 20

The posterior cutaneous nerve of the arms supplies what?

Answer 20

Posterior side of upper arm

Question 21

This nerve branches off the radial nerve in the middle arm?

Answer 21

Inferior lateral cutaneous nerve of the arm

Question 22

The muscular branches of the radial nerve given off in the arm will supply what?

Answer 22

All three heads of the triceps brachii

anconeus

Question 23

The posterior cutaneous nerve of the forearm is given off by the radial nerve where?

Answer 23

In the upper arm

Question 24

The posterior cutaneous nerve of the forearm supplies what?

Answer 24

Narrow area of kin on the lateral side of the posterior forearm

Question 25

Branches given off the radial nerve at the level of the epicondyle supply what muscles?

Answer 25

brachioradialis

Extension carpi radialis longus

Question 26

The superficial branch of the radial nerve given off in the forearm travels to the hand and gives off what nerves?

Answer 26

Dorsal digital nerves

Question 27

The dorsal digital nerves supply what?

Answer 27

Sensory to:
Radial side of the posterior hand
Extensor side of thumb
Extensor side of the proximal phalanges of digits 2 and 3
Lateral half of the extensor side of the ring finger

Question 28

The superficial branch of the radial nerve also gives off the ___________ ulnar nerve

Answer 28

Communicating branch with the ulnar nerve

Question 29

The deep branch of the radial nerve continues as what nerve?

Answer 29

Posterior interosseous nerve

Question 30

The posterior interosseous nerve (off the deep branch of radial nerve) gives off branches to supply which muscles?

Answer 30

Extensor carpi radialis brevis
supinator
Extensor digitorum
Extensor digiti Minami
Extensor carpi ulnaris
Abductor pollicis longus
Extensor pollicis brevis and longus
Extensor indicis

Question 31

Does the posterior interosseous nerve (radial) supply intrinsic hand muscles?

Answer 31

NO

Question 32

The radial nerve sends articular branches to what?

Answer 32

Shoulder and wrist joints

Question 33

What reflexes test radial nerve?

Answer 33

Triceps and brachoiradialis

Question 34

What can happen with a damaged radial nerve?

Answer 34

Wrist drop

Question 35

What is wrist drop?

Answer 35

Unable to hold wrist in extension

Question 36

What is a supraclavicular brachial plexus injury? An infraclavicular one?

Answer 36

Erb-Duchenne

Klumpke

Question 37

What nerve roots are especially important in Erb-Duchenne?

Answer 37

C5 and C6

Question 38

Which nerves are especially important in Klumpke (Dejerine -Klumpke’s)?

Answer 38

C8 and T1

Question 39

Erb-Duchenne will atrophy which muscles?

Answer 39

Biceps brachii, brachialis, deltoid

Question 40

What happens in Erb-Duchenne?

Answer 40

Traction of shoulder (shoulder pulled down)

Question 41

What happens in Klumpke?

Answer 41

Traction (like falling and catch self in a tree)

Question 42

What else may someone with Klumpke demonstrate? Why?

Answer 42

Horner’s syndrome (ptosis, mitosis - dry eye)

Because of T1

Question 43

What is the MC cause of Erb-Duchenne and Klumpke’s?

Answer 43

Birth trauma

Question 44

Both Erb-Duchenne and Klumpke’s are both types of what?

Answer 44

palsy