Cranial Nerves

Question 1

Cranial Nerve I

Answer 1

Olfactory

Afferent (sensory): smell: nose

Efferent (motor): none

Test: identify familiar odors

Question 2

Cranial Nerve II

Answer 2

Afferent (sensory: Sight: eye

Efferent (motor): non

Test: visual fields

Question 3

Cranial Nerve III

Answer 3

Occulomotor

Afferent (sensory): none

Efferent (motor):

voluntary: levator of eyelid; superior, medial, and inferior recti; inferior oblique muscle of eyeball;
autonomic: smooth muscle of eyeball

Test: upward, downward, and medial gaze; rxn to light

Question 4

Cranial Nerve IV

Answer 4

Trochlear

Afferent (sensory): none

Efferent (motor): voluntary motor: superior oblique of eyeball

Test: downward and lateral gaze

Question 5

Cranial Nerve V

Answer 5

Trigeminal

Afferent (sensory): touch, pain: skin of face, mucous membranes of nose, sinuses, mouth and anterior tongue

Efferent (motor): voluntary motor: muscles of mastication

Test: corneal reflex, face sensation, clench teeth; push down on chin to separate jaws

Question 6

Cranial Nerve VI

Answer 6

Abducens

Afferent (sensory): none

Efferent (motor): voluntary motor: lateral rectus of eye

Test: lateral gaze

Question 7

Cranial Nerve VII

Answer 7

Facial

Afferent (sensory): taste: anterior tongue

Efferent (motor): voluntary motor: facial ms, Autonomic: lacrimal, submandibular and sublingual glands

Test: close eyes tight, smile and show teeth, whistle and puff cheeks, identify familiar tastes (sweet, sour)

Question 8

Cranial Nerve VIII

Answer 8

Vestibulocochlear

Afferent (sensory): hearing: ear; Balance: ear

Efferent (motor): none

Test: hear watch ticking, hearing tests, balance and coordination

Question 9

Cranial Nerve IX

Answer 9

Glossopharyngeal

Afferent (sensory):

          touch, pain: posterior tongue, pharynx

          taste: posterior tongue

Efferent (motor):

          voluntary motor: select ms of pharynx;

          autonomic: parotid gland

Test: Gag reflex, ability to swallow

Question 10

Cranial Nerve X

Answer 10

Vagus

Afferent (sensory):

         touch, pain: pharynx, larynx, bronchi

         taste: tongue, epiglottis

Efferent (motor):

         voluntary motor: ms of palate, pharynx, larynx

         autonomic: thoracic and abdominal viscera

Test: gag reflex, ability to swallow, say “ahh”

Question 11

Cranial Nerve XI

Answer 11

Accessory

Afferent (sensory): none

Efferent (motor): voluntary motor: SCM and Trap

Test: resisted shoulder shrug

Question 12

Cranial Nerve XII