Cranial Nerves

Question 1

What is Cranial Nerve 1

Answer 1

Olfactory nerve

Question 2

What happens with loss of CN I

Answer 2

Anosmia (loss of sense of smell)

Question 3

What is CN II?

Answer 3

Optic Nerve

Question 4

What is the function of CNII?

Answer 4

sight pupillary reflexes

Question 5

What happens with damage to CN II?

Answer 5

Monocular blindness, loss of pupillary constriction, absence of blink reflex

Question 6

What is CN III?

Answer 6

Occulomotor

Question 7

What is the function of CN III?

Answer 7

Elevates upper eyelid, moves eye (superior, medial and inferior rectus, inferior oblique)

Question 8

What happens with damage to CN III?

Answer 8

ptosiss (drooping eyelid), dilation of pupil, loss of accommodation of the light reflex

Question 9

What is CN IV?

Answer 9

Trochlear

Question 10

What is the function of CN IV?

Answer 10

Innervates superior oblique muscle

Question 11

What happens with damage to CN IV?

Answer 11

diplopia, failure to rotate eye up and out

Question 12

What is CN V?

Answer 12

Trigeminal Nerve

Question 13

What is the function of CN V?

Answer 13

mastication and sensory nerve for the head

Question 14

What happens with damage to CN V?

Answer 14

Loss of facial sensation, weakness of the muscles of mastication, deviation of opened jaw to ipsilateral side

Question 15

What is CN VI?

Answer 15

Abducens

Question 16

What is the function of CN VI?

Answer 16

Innervates the lateral rectus musle, abducts the eye

Question 17

What happens with damage to CN VI?

Answer 17

diplopia, medial strabismus, abductor paralysis of ipsilateral eye

Question 18

What is CN VII?

Answer 18

Facial Nerve

Question 19

What is the function of CN VII?

Answer 19

facial expression, speech articulation, winking, ingestion of food and drink, taste, salivary and nasal secretions

Question 20

What happens with damage to CN VII?

Answer 20

ipsilateral facial paralysis, dry mouth, loss of taste on ANT 1/3 of tongue (Bells Palsy)

Question 21

What is CN VIII?

Answer 21

Vestibularcochlear

Question 22

What is the function of CN VII?

Answer 22

maintenance of equilibrium, hearing

Question 23

What happens with damage to CN VIII?

Answer 23

vertigo, nystagmus, dysequilibrium, tinnitus, loss of hearing

Question 24

What is CN IX?

Answer 24

Glossopharyngeal

Question 25

What is the function of CN IX?

Answer 25

elevates pharynx, salivary secretion, taste

Question 26

What happens with damage to CN IX?

Answer 26

slight dysphagia, partial dry mouth, loss of taste posterior 1/3 of tongue

Question 27

What is CN X?

Answer 27

Vagus nerve

Question 28

What is the function of CN X?

Answer 28

phonation, visceral sensations and reflexes, cardiac depressor, bronchoconstrictor, GI perstalsis and secretion

Question 29

What happens with damage to CN X?

Answer 29

palpitation (forcible pulsation of the heart)

Question 30

What is CN XI?

Answer 30

Accessory nerve

Question 31

What is the function of CN XI?

Answer 31

deglutition (swallowing) and phonation (carotid part) movements of head and shoulders (spinal part)

Question 32

What is CN XII?

Answer 32

Hypoglossal nerve

Question 33

What is the function of CN XII?

Answer 33

tongue movements

Question 34

What happens with damage to the hypoglossal nerve?

Answer 34

unilateral paralysis of the tongue, deviation to the ipsilateral side with protrusion