Cranial Nerves

Question 1

Cranial Nerve I

Answer 1

Olfactory: S (smell)
Test: identify familiar smells

Question 2

Cranial Nerve II

Answer 2

Optic: S (sight)
Test: test visual fields

Question 3

Cranial Nerve III

Answer 3

Oculomotor: M
Voluntary- levator eyelid, superior/medial/inferior recti, inferior oblique eye muscle
Autonomic- smooth muscle of eyeball
Test: up/down/medial gaze, reaction to light

Question 4

Cranial Nerve IV

Answer 4

Trochlear: M
Voluntary: superior oblique muscle of eyeball
Test: down/inward glaze

Question 5

Cranial Nerve V

Answer 5

Trigemical: B (touch, pain- skin of face, mucous membranes of nose, sinuses, mouth, ant. tongue)
Voluntary: mastication muscles
Test: corneal reflex, face sensation, clench teeth

Question 6

Cranial Nerve VI

Answer 6

Abducens: M
Voluntary: lateral rectus muscle of eyeball
Test: lateral gaze

Question 7

Cranial Nerve VII

Answer 7

Facial: B (taste- ant. tongue)
Voluntary: facial muscles
Autonomic: lacrimal, submandibular, sublingual glands
Test: squeeze eyes shut, smile & show teeth, whistle/puff cheeks, identify familiar tastes

Question 8

Cranial Nerve VIII

Answer 8

Vestibulocochlear: S (Hearing and Balance)
Test: hear watch ticking, other hearing tests, balance/coordination tests

Question 9

Cranial Nerve IX

Answer 9

Glossopharyngeal: B (touch, pain, taste- posterior tongue)
Voluntary: select muscle of pharynx
Autonomic: parotid gland
Test: gag reflex, ability to swallow

Question 10

Cranial Nerve X

Answer 10

Vagus: B (touch, pain- pharynx, larynx, bronchi: taste- tongue, epiglottis)
Voluntary: muscles 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: M
Voluntary: sternoceidomastoid and trapezius
Test: resisted shoulder shrug

Question 12

Cranial Nerve XII

Answer 12

Hypoglossal: M
Voluntary: muscles of tongue
Test: tongue protrusion (abnormal = tongue will deviate to one side)