Cranial Nerves

Question 0

CN II (Optic)

Answer 0

Sight, pupillary reflex (afferent)

Damage: monocular blindness, loss of pupillary constriction, absence of blink reflex

Question 1

CN I (Olfactory)

Answer 1

Smell

Anosmia (loss of smell)

Question 2

CN III (Occulomotor)

Answer 2

Moves the eye and elevates the upper eyelid; constricts pupil
Damage: ptosis, dilation of pupil, loss of the accommodation of the light reflex

Question 3

CN IV (Trochlear)

Answer 3

Motor function for superior oblique muscle

Damage: diploplia, and failure to move eye up and out

Question 4

CN V (Trigeminal)

Answer 4

Mastication, and sensory nerve for the head

Damage: loss of facial sensation, weakness of muscles of mastication, deviation of opened jaw to ipsilateral side

Question 5

CN VI (Abducens)

Answer 5

Abducts the eye via nerve supply to lateral rectus muscle

Damage: diploplia, convergent squint (medial strabismus), and abductor paralysis of ipsilateral eye

Question 6

CN VII (Facial)

Answer 6

Facial expression, speech articulation, winking, ingestion of food and drink, taste, salivary and nasal secretions

Question 7

CN VIII (vestibulocochlear)

Answer 7

Maintenance of equilibrium, hearing

Damage: vertigo, nystagmus, dysequillibrium, tinnitus, loss of hearing

Question 8

CN IX (Glossopharyngeal)

Answer 8

Elevates pharynx, salivary seceration, taste

Damage: slight dysphagia, partial dry mouth, loss of taste in posterior 1/3 of tongue

Question 9

CN X (vagus)

Answer 9

Phonation, visceral sensations and reflexes, cardiac depressor, bronchoconstrictor, GI tract peristalsis and secretion
Damage: Palpitations, tachycardia, vommiting, slowing of respirations, ipsilateral paralysis of of soft palate and larynx, hoarseness, anesthesia of the larynx

Question 10

CN XI (Spinal accessory)

Answer 10

Deglutition and phonation (carotid Part), movements of head and neck

Question 11

CN XII (Hypoglossal)

Answer 11

Movements of the tongue

Damage: unilateral paralysis of the tongue, deviation to teh ipsilateral side with protrusion