Cranial Nerves

Question 1

CN I

Answer 1

Olfactory

Sensory

functional innervation involved with smell/olfaction

Question 2

CN II

Answer 2

Optic

Sensory

functional innervation involved with vision

“optic chiasma”

Question 3

CN III

Answer 3

Occulomotor

Motor

functional innervation involved with 4/6 extrinsic eye muscles

Parasympathetic motor: iris and lens

Question 4

CN IV

Answer 4

Trochlear

Motor

innervates 1/6 of the superior oblique muscle

Question 5

CN V

Answer 5

Trigeminal

Motor and Sensory

M: functional innervation of muscles of mastication (to chew)

S: functional innervation of face sensations, oral cavity

Question 6

CN VI

Answer 6

Abducens

Motor

functional innervation of 1/6 of lateral rectus

(LR6 SO4 3)

Question 7

CN VII

Answer 7

Facial muscles

Motor and Sensory

M: functional innervation of the facial muscles

S: functional innervation of the anterior 2/3 of taste buds

Parasympathetic: lacrimal gland, submandibular, sublingual glands

Question 8

CN VIII

Answer 8

Vestibulocochlear

Sensory

functional innervation of hearing equilibrium

vestibulo and cochlear of inner ear

Question 9

CN IX

Answer 9

Glossopharyngeal

Motor and Sensory

M: pharynx muscle (swallowing)

S: posterior 1/3 of the tongue

Parasympathetic: parotid gland

tongue and pharynx

Question 10

CN X

Answer 10

Vagus

Motor and Sensory

M: functional innervation of pharynx and larynx muscles

S: most organ visceral sensory

Parasympathetic: thoracic and abdominal organs

Question 11

CN XI

Answer 11

Accessory

Motor

functional innervation of neck muscles (trapezius and sternocleidomastoid)

“neck movements”

Question 12

CN XII

Answer 12

Hypoglossal

Motor

functional innervation of tongue muscles