Cranial and Peripheral Nerves

Question 1

Ulnar N:
Spinal cord segment
Muscle innervation
Sensory innervation

Answer 1

• C7-T1
• flexor carpi ulnaris, flexor digitorum profundus (medial half), interossei, 4th/5th lumbricals, adductor pollicis
• medial portion of 4th finger and all of 5th finger

Question 2

Trochlear

Answer 2

CN IV

function: superior oblique eye muscle (down and in movement)

Question 3

Femoral N:
Spinal cord segment
Muscle innervation
Sensory innervation

Answer 3

• L2-L4
• iliacus, sartorius, quadriceps, pectineus
• anterior/medial thigh

Question 4

Superficial fibular N:
Spinal cord segment
Muscle innervation
Sensory innervation

Answer 4

• L5-S2
• fibularis longus/brevis
• dorsum of foot, anterior/lateral lower leg/ankle

Question 5

Musculocutaneous N:
Spinal cord segment
Muscle innervation
Sensory innervation
Injured with fracture to clavicle

Answer 5

• C5, C6
• coracobrachialis, biceps brachii, brachialis
• anterolateral forearm

Question 6

Glossopharyngeal

Answer 6

CN IX

function: elevates pharynx, salivary secretions

Question 7

Optic

Answer 7

CN II

function: pupillary reflexes, sight

Question 8

Vagus

Answer 8

CN X

function: phonation (say Ahhh), visceral sensations, cardiac depressor, bronchoconstrictor, GI tract peristalsis

Question 9

Accessory

Answer 9

CN X

Ifunction: movements of head and shoulders

Question 10

Deep peroneal/fibular N:
Spinal cord segment
Muscle innervation
Sensory innervation

Answer 10

• L4-S2
• tibialis anterior and all extensors of ankle/foot (extensor hallucis longus/brevis, extensor digitorum longus/brevis, dorsal interossei, fibularis tertius)
• web space b/w 1st and 2nd toes on dorsum of foot

Question 11

Vestibulocochlear

Answer 11

CN VIII

function: equilibrium, hearing

Question 12

Median N:
Spinal cord segment
Muscle innervation
Sensory innervation

Answer 12

• C6-T1
• pronators, wrist/finger flexors on radial side, most thumb muscles
• palmar 1-3 fingers and radial half of 4th finger

Question 13

Olfactory

Answer 13

CN Ifunction: smell

Question 14

Dorsal scapular N
Spinal cord segment
Muscle innervation

Answer 14

• C5, C6

- rhomboids and levator scapulae

Question 15

Oculomotor

Answer 15

CN III

function: eye movement, opening eyelid, pupillary light reflex

Question 16

Trigeminal

Answer 16

CN V

function: mastication and sensory nerve for the head; corneal reflex

Question 17

Suprascapular N
Spinal cord segment
Muscle innervation

Answer 17

• C5, C6

- supra/infraspinatus

Question 18

Long thoracic NSpinal cord segmentMuscle innervation

Answer 18

-C5, C6, C7-serratus anterior

Question 19

Hypoglossal

Answer 19

CN XII

function: movements of the tongue (esp tongue protrusion)

Question 20

Radial N
Spinal cord segment
Muscle innervation
Sensory innervation

Answer 20

• C5-T1
• triceps, brachoradialis, supinator, and extensors of forearm/wrist
• posterior arm/forearm and radial side of posterior hand

Question 21

Tibial N
Spinal cord segment
Muscle innervation
Sensory innervation

Answer 21

• L4-S3
• gastroc/soleus, plantaris, popliteus, posterior tibialis
• posterior/lateral calf and heel

Question 22

Facial

Answer 22

CN VII

function: facial express, speech, ingestion of food/drink

Question 23

Abducens

Answer 23

CN VI

function: lateral rectus eye muscle

Question 24

Axillary N
Spinal cord segment
Muscle innervation
Sensory innervation
Injured with humeral neck fracture or anterior dislocation

Answer 24

• C5, C6
• deltoid, teres minor
• lateral proximal arm

Question 25

Sciatic N
Spinal cord segment
Muscle innervation
Sensory innervation

Answer 25

• L4-S3
• hamstrings and adductor magnus
• see distribution for deep/superficial fibular N and tibial N

Question 26

Inferior gluteal nerve:

Innervation

Answer 26

Glute max