Cranial Nerve Involvement

Question 1

smell (olfaction)

Answer 1

CN I Olfactory

Question 2

equilibrium and hearing

damage = sensorineural hearing loss

Answer 2

CN VIII Vestibulocochlear/acoustic

Question 3

serves the superior oblique eye muscle

-acts as a pulley to move the eyes downward towards the nose.

Answer 3

CN IV Trochlear

Question 4

sensations from internal organs& parasympathetic motor regulation of visceral organs

damage = affects ability to swallow.

Answer 4

CN X Vagus

Question 5

serves muscles of the tongue

-damage = weak tongue, tongue not at midline when pt sticks it out, etc…

Answer 5

CN XII Hypoglossal

Question 6

serves the lateral rectus eye muscle

• lateral = side
• controls eye movements to the sides
• damage = twitching and/or nystagmus

Answer 6

CN VI Abducens

Question 7

vision

damage = loss of peripheral vision & visual fields

Answer 7

CN II Optic

Question 8

sensory from face and mouth; motor to muscles of mastication

Answer 8

CN V Trigeminal

Question 9

serves muscles that move the head, neck, and shoulders

-damage = impaired ability to move head and neck, and raise shoulders

Answer 9

CN XI Accessory

Question 10

serves the muscles of the eye

damage = ptosis & pupil dysfunction

Answer 10

CN III Occulomotor

Question 11

serves the pharynx (throat) for swallowing, posterior 1/3 of tongue, & parotid salivary gland.

damage = dysphagia; uvula is not at midline when pt says /ahhh/ and palate does not rise.

Answer 11

CN XI Glossopharyngeal

Question 12

serves the muscles of facial expression, lacrimal glands, and salivary glands

damage = inability to wrinkle forhead, close eyes, smile, pucker lips, puff cheeks, with facial asymmetry + nasolabial fold weakness or flattening when pt smiles.
-check to see if both sides of the face move the same way.

Answer 12

VII Facial