nerves of brachial plexus and their function

Question 1

what peripheral nerves come off the roots of the brachial plexus and what are their spinal cord segments

Answer 1

long thoracic (C5-7) and dorsal scapular (C4-5)

Question 2

what is the function of long thoracic nerve

Answer 2

• motor (serratus anterior)
• sensory
  -postganglionic sympathetic

Question 3

what is the function of dorsal scapular nerve

Answer 3

• motor (levator scapulae & rhomboids)
  -postganglionic sympathetic

Question 4

what peripheral nerves come off the trunks of the brachial plexus and what are their spinal cord segments

Answer 4

• suprascapular (C4-6)
• subclavian (C5-6)

Question 5

what is the function of suprascapular nerve

Answer 5

-motor (infraspinatus & supraspinatus)
- sensory
-postganglionic sympathetic

Question 6

what is the function of subclavian nerve

Answer 6

• motor (subclavius)
• sensory
  -postganglionic sympathetic

Question 7

do any peripheral nerves come off the middle or lower trunks of the brachial plexus?

Answer 7

NO

Question 8

do any peripheral nerves come off the divisions of the brachial plexus?

Answer 8

NO

Question 9

what peripheral nerves come off the lateral cord of the brachial plexus and what are their spinal cord segments

Answer 9

• lateral pectoral (C5-7)
  -musculocutaneous (C5-7)
• lateral root of median nerve (C5-7)

Question 10

what is the function of lateral pectoral nerve

Answer 10

• motor (clavicular head of pectoralis major and full pectoralis minor)
• sensory
  -postganglionic sympathetic

Question 11

what are the branches of musculocutaneous nerve?

Answer 11

• muscular branches
• lateral cutaneous nerve of the forearm

Question 12

what is the function of the muscular branches of musculocutaneous nerve?

Answer 12

• motor (biceps brachii, coracobrachialis, and brachialis)
• sensory
  -postganglionic sympathetic

Question 13

what is the function of the lateral cutaneous nerve of the forearm which is a branch of musculocutaneous

Answer 13

• sensory
• postganglionic sympathetic
  (to the lateral aspect of the forearm)

Question 14

what are the branches off the lateral root of median nerve of the musculocutaneous nerve

Answer 14

1. muscular branches to the forearm
2. anterior interosseous nerve
3. palmar cutaneous branch
4. muscular branches to the hand
5. recurrent branch of the median nerve
6. common and proper palmar digital nerves

Question 15

what is the function of the muscular branches to the forearm of the lateral root of median nerve

Answer 15

• motor (flexor carpi radialis, palmaris longus, flexor digitorum superficialis, and pronator teres)
• sensory
  -postganglionic sympathetic

Question 16

what is the function of the anterior interosseous nerve of lateral root of median nerve

Answer 16

• motor (flexor pollicis longus, flexor digitorum profundus & pronator quadratus)
• sensory
  -postganglionic sympathetic

Question 17

what is the function of the palmar cutaneous branch of lateral root of median nerve

Answer 17

• sensory
  -postganglionic sympathetic
  (skin overlaying the radial aspect of the palm of the hand)

Question 18

what is the function of the muscular branches in the hand of the lateral root of median nerve

Answer 18

• motor (lateral two lumbrical muscles)
• sensory
  -postganglionic sympathetic

Question 19

what is the function of recurrent branch of median nerve

Answer 19

• motor (flexor pollicis brevis, abductor pollicis brevis, and opponens pollicis muscles)
• sensory
  -postganglionic sympathetic

Question 20

what is the spinal cord segment of the recurrent branch of the median nerve

Answer 20

C6-T1

Question 21

what is the function of common and proper plamar digital nerves

Answer 21

• sensory
  -postganglionic sympathetic
  (skin overlying digits 1-4)

Question 22

what are the peripheral nerves off the medial cord of the brachial plexus

Answer 22

• medial pectoral nerve
• medial cutaneous nerve of the arm
• medial cutaneous nerve of the forearm
• medial root of median nerve
• ulnar nerve

Question 23

what is the function of medial pectoral nerve

Answer 23

• motor (sternocostal head of pectoralis major & full pectoralis minor)
• sensory
  -postganglionic sympathetic

Question 24

what is the function of medial cutaneous nerves of arm and forearm

Answer 24

skin overlaying the medial aspect of the arm and forearm

Question 25

what are the spinal cord segments of the medial root of median nerve

Answer 25

C8-T1

Question 26

are the branches of nerves off the medial root of the median nerve the same as the lateral root of the median nerve (with same named branches and functions)

Answer 26

YES

Question 27

what is the spinal cord segment of the lateral root of median nerve

Answer 27

C5-7

Question 28

what spinal cord segments are in ulnar nerve

Answer 28

C7-T1

Question 29

what are the branches of ulnar nerve

Answer 29

- muscular branches on the forearm - palmar cutaneous branch - dorsal cutaneous branch - deep (terminal) branch

Question 30

what is the function of muscular branches of the forearm from ulnar nerve

Answer 30

- motor (flexor carpi ulnaris, flexor digitorum profundus) - sensory -postganglionic sympathetic

Question 31

what is the function of palmar (cutaneous) branches of ulnar nerve that then turn into common & proper palmar digital nerve

Answer 31

1. palmar cutaneous - sensory -postganglionic sympathetic (overlaying skin on ulnar side of palm) 2. digits 4-5 - common & proper digital nerves

Question 32

function of dorsal branch of ulnar nerve

Answer 32

- sensory -postganglionic sympathetic (skin overlaying dorsal surfaces of digits 4-5)

Question 34

what peripheral nerves of the brachial plexus come off the posterior cord

Answer 34

1. axillary 2. radial 3. upper subscapular 4. thoracodorsal 5. lower subscapular

Question 35

what are the spinal cord segments for upper subscapular nerve and what is its function?

Answer 35

1. (C5-6) - motor (subscapularis) - sensory -postganglionic sympathetic

Question 36

what spinal cord segments are in thoracodorsal nerve and what is its function

Answer 36

1. (C6-8) - motor (latissimus dorsi) - sensory -postganglionic sympathetic

Question 37

what spinal cord segments are in lower subscapular nerve and what is its function

Answer 37

1. (C5-6) - motor (subscapularis & teres major) - sensory -postganglionic sympathetic

Question 38

what spinal cord segments are in axillary nerve

Answer 38

(C5-6)

Question 39

what branches come off axillary nerve

Answer 39

1. muscular branches 2. superior lateral cutaneous nerve of the arm

Question 40

what is the function of muscular branches of axillary nerve

Answer 40

- motor (deltoid and teres minor) - sensory -postganglionic sympathetic

Question 41

what is the function of superior lateral cutaneous nerve of the arm

Answer 41

- sensory -postganglionic sympathetic skin overlaying the superior lateral aspect of the arm

Question 42

what spinal cord segments are in radial nerve

Answer 42

(C5-T1)

Question 43

what branches come off radial nerve

Answer 43

1. muscular branches in the arm 2. muscular branches in the forearm 3. posterior cutaneous nerve of the forearm 4. superficial (terminal) branch

Question 44

what is the function of muscular branches in the arm of radial nerve

Answer 44

- motor (triceps brachii and brachialis - just a portion) - sensory -postganglionic sympathetic

Question 45

what is the function of muscular branches in the forearm of radial nerve

Answer 45

- motor (anconeus, brachioradialis, supinator, extensor carpi radialis longus, extensor carpi radialis brevis, extensor carpi ulnaris, extensor digitorum, extensor digiti minimi, extensor indivis, extensor digit minimi, extensor indicis, extensor pollicis brevis, extensor pollicis longus, & abductor pollicis longus) - sensory -postganglionic sympathetic

Question 46

what is the function of posterior cutaneous nerve of the forearm a branch of radial nerve

Answer 46

- sensory -postganglionic sympathetic ( skin overlaying the posterior aspect of the forearm)