Cranial Nerves Functions

Question 1

CN I (olfactory)

Answer 1

provides sense of smell

Question 2

CN II (optic)

Answer 2

provides sense of vision

Question 3

CN III (oculomotor)

Answer 3

gives:
eye movement
accommodation
eyelid opening
pupillary constriction

Question 4

CN IV (trochlear)

Answer 4

provides eye motor movements through the superior oblique muscle:
abducts
depresses
internally rotates

Question 5

CN V (trigeminal)

Answer 5

innervates three sections of face:
facial sensation (sensory)
mastication (motor)
provides secretions of the mouth and nasal cavities

Question 6

CN VI (abducens)

Answer 6

abducts eye to look away from the nose through contraction of the lateral rectus muscle

Question 7

CN VII (facial)

Answer 7

provides for facial motor and sensory perception:
lacrimation
salivation
taste of anterior 2/3 of tongue (sensory)
facial movement (motor)
stapedius muscle (stabilizes stapes to wall of ear)
eyelid closing

Question 8

CN VIII (vestibulocochlear)

Answer 8

provides for sense of hearing and balance

Question 9

CN IX (glossopharyngeal)

Answer 9

Sensory:

• taste of posterior 1/3 of tongue
• monitoring carotid body and sinus

Motor:
-acts on the sylopharyngeus to move the larynx/pharynx during swallowing

Salivation

Question 10

CN X (vagus)

Answer 10

Sensory:

• aortic arch chemoreceptors and baroreceptors
• taste of epiglottic region

Motor:

• swallowing
• palate elevation
• talking
• coughing
• midline uvula

Question 11

CN XI (accessory)

Answer 11

head turning

shoulder shrugging

Question 12

CN XII (hypoglossal)

Answer 12

tongue movement