nerve roots

Question 1

Spinal accessory nerve

Answer 1

1. Trapezius
2. Elevates shoulder/arm and fixes scapula
3. CN XI, C3, C4

Question 2

Phrenic nerve

Answer 2

1. Diaphragm
2. Inspiration
3. C3, C4, C5

Question 3

Dorsal scapular nerve 1

Answer 3

1. Rhomboids
2. Draw scapula up and in
3. C4, C5

Question 4

Dorsal scapular nerve 2

Answer 4

1. Levator scapulae
2. Elevates scapula
3. C4, C5

Question 5

Long (Bell’s) thoracic nerve

Answer 5

1. Serratus anterior
2. Fixes scapula on arm raise
3. C5, C6, C7

Question 6

Lateral pectoral nerve

Answer 6

1. Pectoralis major (clavicular head)
2. Pulls shoulder forward
3. C5, C6

Question 7

Medial pectoral nerve 1

Answer 7

1. Pectoralis major (sternal head)
2. Adducts and medially rotates arm
3. C6, C7, C8, T1

Question 8

Medial pectoral nerve 2

Answer 8

1. Pectoralis minor
2. Depresses scapula and pulls shoulder forward
3. C6, C7, C8

Question 9

Suprascapular nerve 1

Answer 9

1. Supraspinatus
2. Abducts humerus from 0° to 15°
3. C5, C6

Question 10

Suprascapular nerve 2

Answer 10

1. Infraspinatus
2. Externally rotates humerus
3. C5, C6

Question 11

Subscapular nerve 1

Answer 11

1. Subscapularis
2. Internally rotates humerus
3. C5, C6

Question 12

Subscapular nerve 2

Answer 12

1. Teres major
2. Adducts and internally rotates humerus
3. C5, C6, C7

Question 13

Thoracodorsal nerve

Answer 13

1. Latissimus dorsi
2. Adducts and internally rotates humerus
3. C6, C7, C8

Question 14

Axillary nerve 1

Answer 14

1. Teres minor
2. Adducts and externally rotates humerus
3. C5, C6

Question 15

Axillary nerve 2

Answer 15

1. Deltoid
2. Abducts humerus beyond 15°
3. C5, C6

Question 16

Musculocutaneous nerve 1

Answer 16

1. Biceps brachii
2. Flexes and supinates arm and forearm
3. C5, C6

Question 17

Musculocutaneous nerve 2

Answer 17

1. Brachialis
2. Flexes forearm
3. C5, C6

Question 18

Musculocutaneous nerve 3

Answer 18

1. Coracobrachialis
2. Flexes and adducts arm
3. C6, C7

Question 19

Radial nerve 1

Answer 19

1. Triceps
2. Extends forearm
3. C6, C7, C8

Question 20

Radial nerve 2

Answer 20

1. Brachioradialis
2. Flexes forearm
3. C5, C6

Question 21

Radial nerve 3

Answer 21

1. Extensor carpi radialis (longus and brevis)
2. Extend wrist, abduct hand
3. C5, C6

Question 22

posterior interosseous nerve 7

Answer 22

1. Supinator
2. Supinates forearm
3. C6, C7

Question 23

Posterior interosseous nerve 1

Answer 23

1. Extensor carpi ulnaris
2. Extends wrist, adducts hand
3. C7, C8

Question 24

Posterior interosseous nerve 2

Answer 24

1. Extensor digitorum communis
2. Extends fingers (test at metacarpophalangeal joints)
3. C7, C8

Question 25

Posterior interosseous nerve 3

Answer 25

1. Extensor digiti quinti
2. Extends little finger
3. C7, C8

Question 26

Posterior interosseous nerve 4

Answer 26

1. Abductor pollicis longus
2. Abducts thumb in plane of palm
3. C7, C8

Question 27

Posterior interosseous nerve 5

Answer 27

1. Extensor pollicis (longus and brevis)
2. Extends thumb
3. C7, C8

Question 28

Posterior interosseous nerve 6

Answer 28

1. Extensor indicis proprius
2. Extends index finger
3. C7, C8

Question 29

Median nerve 1

Answer 29

1. Pronator teres
2. Pronates and flexes forearm
3. C6, C7

Question 30

Median nerve 2

Answer 30

1. Flexor carpi radialis
2. Flexes wrist, abducts hand
3. C6, C7

Question 31

Median nerve 3

Answer 31

1. Palmaris longus
2. Flexes wrist
3. C7, C8, T1

Question 32

Median nerve 4

Answer 32

1. Flexor digitorum superficialis
2. Flexes metacarpophalangeal and proximal interphalangeal joints
3. C7, C8, T1

Question 33

Median nerve (carpal tunnel syndrome) 2

Answer 33

1. Opponens pollicis
2. Flexes, opposes thumb
3. C8, T1

Question 34

Median nerve (carpal tunnel syndrome) 3

Answer 34

1. Abductor pollicis brevis
2. Abducts thumb perpendicular to plane of palm
3. C8, T1

Question 35

Median nerve (carpal tunnel syndrome) 4

Answer 35

1. Flexor pollicis brevis (superficial head)
2. Flexes first phalanx of thumb
3. C8, T1

Question 36

Median nerve (carpal tunnel syndrome) 1

Answer 36

1. Lumbricals (I, II)
2. For second and third digits, flexes metacarpophalangeal joints, extends other joints
3. C8, T1