Cranial Nerves

Question 1

CN I

Answer 1

olfactory nerve

Question 2

CN I - Components

Answer 2

special sensory (olfaction)

Question 3

CN I - Actions

Answer 3

SpS: carries afferent impulses for the sense of smell

Question 4

CN II

Answer 4

optic nerve

Question 5

CN II - Components

Answer 5

special sensory (vision)

Question 6

CN II - Actions

Answer 6

SpS: carrying afferent impulses for vision

Question 7

CN III

Answer 7

oculomotor nerve

Question 8

CN III - Components

Answer 8

somatic motor

visceral motor

Question 9

CN III - Actions

Answer 9

SM: innervation to 4 of 6 extraocular muscles
functions in proprioception
VM: innervation (pupil and ciliary muscles)

Question 10

CN IV

Answer 10

trochlear nerve

Question 11

CN IV - Components

Answer 11

somatic motor

Question 12

CN IV - Actions

Answer 12

SM: innervates the superior oblique muscles (turns eye inferolaterally)

Question 13

CN V

Answer 13

trigeminal nerve

Question 14

Divisions of CN V (3)

Answer 14

opthalmic
maxillary
mandibular

Question 15

CN V*1

Answer 15

opthalmic nerve

Question 16

CN V*1 - Components

Answer 16

somatic sensory

Question 17

CN V*1 - Actions

Answer 17

SS: sensation from cornea, forehead, scalp, eyelids, nose and mucosa of nasal cavity

Question 18

CN V*2

Answer 18

maxillary nerve

Question 19

CN V*2 - Components

Answer 19

somatic sensory

Question 20

CN V*2 - Actions

Answer 20

SS: sensation of skin over maxilla and palate

Question 21

CN V*3

Answer 21

mandibular nerve

Question 22

CN V*3 - Components

Answer 22

somatic sensory

somatic motor

Question 23

CN V*3 - Actions

Answer 23

SS: sensation from skin over mandible and anterior 2/3 of tounge
SM: muscles of mastication

Question 24

CN VI

Answer 24

abducent nerve

Question 25

CN VI - Components

Answer 25

somatic motor

Question 26

CN VI - Actions

Answer 26

SM: innervates lateral rectus muscle (lateral eye movement)

Question 27

CN VII

Answer 27

facial nerve

Question 28

CN VII - Components

Answer 28

somatic motor
somatic sensory
special sensory
visceral motor

Question 29

CN VII - Actions

Answer 29

SM: facial expressions
SS: sensation from skin of external acoustic meatus
SpS: taste from anterior 2/3 of tongue
VM: tranmittal of autonomic impulses to lacrimal and salivary glands

Question 30

CN VIII

Answer 30

vestibulocochlear nerve

Question 31

CN VIII - Components

Answer 31

special sensory

Question 32

CN VIII - Actions

Answer 32

SpS: hearing (cochlear) and balance/equilibrium (vestibular)

Question 33

CN IX

Answer 33

glossopharyngeal nerve

Question 34

CN IX - Components

Answer 34

somatic motor
somatic sensory
special sensory
visceral motor
visceral sensory

Question 35

CN IX - Actions

Answer 35

SM: innervates part of tongue and pharynx
SS: external ear, pharynx, middle ear
SpS: taste from posterior 1/3 of tongue
VM: motor fibers to parotid salivary gland
VS: carotid sinus

Question 36

CN X

Answer 36

vagus nerve

Question 37

CN X - Components

Answer 37

somatic motor
somatic sensory 
special sensory
visceral motor
visceral sensory

Question 38

CN X - Actions

Answer 38

SM: muscles of pharynx, larynx, superior 2/3 esophagus
SS: sensation from auricle and external acoustic meatus and tympanic membrane
SpS: taste from epiglottis and palate
VM: parasympathetic fibers to heart, lungs, and visceral organs
VS: sensation from root of tongue, heart, lungs, visceral organs, aortic body and arch

Question 39

CN XI

Answer 39

accessory nerve

Question 40

CN XI - Components

Answer 40

somatic motor

Question 41

CN XI - Actions

Answer 41

SM: innervates trapezius and sternocleidomastoid and fibers of larynx, pharynx, and soft palate

Question 42

CN XII

Answer 42

hypoglossal nerve

Question 43

CN XII - Components

Answer 43

somatic motor

Question 44

CN XII - Actions

Answer 44

SM: innervates intrinsic and extrinsic muscle of tongue (swallowing and speech)