brachial plexus

Question 1

cord level of dorsal scapular nerve

Answer 1

c5

Question 2

dorsal scapular nerve innervates what muscles?

Answer 2

• levator scapulae
• rhomboid minor
• rhomboid major

Question 3

origin of suprascapular nerve

Answer 3

c5-6

Question 4

suprascapular nerve innervates what muslces?

Answer 4

• surpaspinatus

- infraspinatus

Question 5

origin of long thoracic nerve

Answer 5

c5-7

Question 6

long thoracic nerve innervates what muscle?

Answer 6

serratus anterior

Question 7

origin of nerve to subclavius

Answer 7

c5-6

Question 8

nerve to subclavius innervates what muscles?

Answer 8

subclavius

Question 9

origin of upper subscapular nerve

Answer 9

c5

Question 10

upper subscapular nerve innervates what muscle?

Answer 10

subscapularis

Question 11

origin of thoracodorsal nerve

Answer 11

c6-8

Question 12

thoracodorsal nerve innervates what muscle?

Answer 12

latissimus doris

Question 13

origin of lower subscapular nerve

Answer 13

c6

Question 14

lower subscapular nerve innervates what muscle?

Answer 14

teres major

Question 15

origin of medial pectoral nerve

Answer 15

c8-t1

Question 16

medial pectoral nerve innervates what muscles?

Answer 16

pectoralis major

pectoralis minor

Question 17

origin of lateral pectoral nerve

Answer 17

c5-7

Question 18

lateral pectoral nerve innervates what muscle?

Answer 18

pectoralis major

Question 19

origin of medial brachial cutaneous

Answer 19

c8-t1

Question 20

cutaneous branch of medial cutaneous?

Answer 20

medial brachial cutaneous nerve

Question 21

origin of medial antebrachial cutaneous

Answer 21

c8-t1

Question 22

cutaneous branch of medial antebrachial cutaneous?

Answer 22

medial antebrachial cutaneous nerve

Question 23

origin of musculocutaeous nerve?

Answer 23

c5-7

Question 24

musculocutaeous nerve innervates what muscles?

Answer 24

• coracobrachialis
• biceps brachii
• brachialis

Question 25

cutaneous branch of musculocutaeous nerve?

Answer 25

lateral antebrachial cutaneous nerve

Question 26

origin of axillary nerve

Answer 26

c5-6

Question 27

axillary nerve innervates what muscles?

Answer 27

- deltoid | - teres minor

Question 28

cutaneous branch of axillary nerve?

Answer 28

superior lateral brachial cutaneous nerve

Question 29

origin of radial nerve

Answer 29

c5-t1

Question 30

radial nerve innervates what muscles?

Answer 30

- brachialis - triceps brachii - anconeus - supinator - brachioradialis - abductor pollicis longus - extensor arm muscles (will learn later)

Question 31

cutaneous branches of radial nerve?

Answer 31

- inferior lateral brachial cutaneous nerve - posterior brachial cutaneous nerve - posterior antebrachial cutaneous nerve - superficial branch of radial nerve

Question 32

origin of median nerve

Answer 32

lateral root = c6-7 | medial root = c8-t1

Question 33

median nerve innervates what muscles?

Answer 33

- pronator teres - pronator quadratic - palmaris longus - flexor arm/ hand muscles (will learn later) - abductor pollicis brevis - 1st and 2nd lumbricals

Question 34

cutaneous branches of median nerve?

Answer 34

- recurrent palmar branch of median nerve - common palmar digital nerves - proper palmar digital nerves

Question 35

origin of ulnar nerve

Answer 35

c8-t1

Question 36

ulnar nerve innervates what muscles?

Answer 36

- flexor muscles of the hand (will learn later) | - 3rd and 4th lumbricals

Question 37

cutaneous branches of ulnar nerve?

Answer 37

- deep branch of ulnar nerve - dorsal branch of ulnar nerve - dorsal digital nerves - common palmar digital nerves - proper palmar digital nerves

Question 38

mechanism of hyperabduction syndrome

Answer 38

- prolonged shoulder hyperabduction | - causes compression of neurovascular structures as they pass under coracoid process and pectoralis minor tendon

Question 39

symptoms of hyperabduction syndrome

Answer 39

extremity numbness and paresthesia

Question 40

aneurysm of axillary artery

Answer 40

- compresses trunks of brachial plexus | - causes pain and anesthesia

Question 41

axillary lymph node dissection

Answer 41

- needed for staging and determining treatment for cancer | - risk damage to long thoracic nerve and thoracodorsal nerve

Question 42

winged scapula

Answer 42

- paralyzed long thoracic nerve | - pushes medial portion of scapula out of the back

Question 43

erb-duchesse palsy

Answer 43

- deltoid, biceps, and brachialis are paralyzed - upper limb is adducted - arm is medially rotated - elbow is extended - damage to musculocutaeous nerve

Question 44

klumpke paralysis

Answer 44

- "claw hand" deformity | - potential for horner's syndrome: if present, there is miosis

Question 45

dermatome

Answer 45

region of skin innervated by GSA axons from a SINGLE spinal nerve root

Question 46

cutaneous nerve

Answer 46

supplies an area of skin that is related to peripheral nerve; contains fibers from SEVERAL individual spinal nerves

Question 47

injury to musculocutaneous n. damages what muscles?

Answer 47

muscles of anterior arm/flexor of forearm

Question 48

injury to axillary n. damages what muscles?

Answer 48

shoulder muscles

Question 49

injury to radial n. damages what muscles?

Answer 49

muscles of posterior arm and forearm/extensors

Question 50

injury to median n. damages what muscles?

Answer 50

muscles of the anterior forearm/flexors of hand and thumb

Question 51

injury to ulnar n. damages what muscles?

Answer 51

muscles of the medial forearm and hand/flexors of hands and digits