Cranial Nerves

Question 1

CN I

Answer 1

Olfactory

Question 2

CN I function is…

Answer 2

Smell

Question 3

CN I travels…

Answer 3

Inferior surface of the brain to synapse at the olfactory bulbs then to the pyriform cortex

Question 4

CN II

Answer 4

Optic

Question 5

CN II function is…

Answer 5

Vision

Question 6

CN I issues is…

Answer 6

Anosmia

Question 7

CN II travels to…

Answer 7

Synapses at thalamus before information is carried to occipital lobe

Question 8

CN II issues is…

Answer 8

Blindness and visual field cuts

Question 9

CN III

Answer 9

Oculomotor

Question 10

CN III function

Answer 10

Eye movement and lifts eyelids

Question 11

CN III issues is…

Answer 11

Strabismus (eyes do not move together), diploipia (double vision)

Question 12

CN IV

Answer 12

Trochlear

Question 13

CN IV function…

Answer 13

Controls superior oblique muscle-internal rotation of the eye, eye depression, lateral eye movement

Question 14

CN IV travels to…

Answer 14

Crosses the midline before exiting the brainstem

Question 15

Cn IV damage may cause…

Answer 15

Nucleus damage affects the contralateral eye and nerve damage from this CN will affect the ipsilateral eye

Question 16

CN V function

Answer 16

Sensory- touch, temperature, pain, proprioception information from the head (includes: oral and nasal cavities, sinuses, teeth, anterior 2/3 of the tongue, anterior 1/2 of the pinna, external auditory meatus, external surface of the ear drum)
Motor-Assists with mastication, tenses soft palate and tenses tensor tympani

Question 17

CN V clinical signs are…

Answer 17

Trigeminal neuralgia, trismus, paresis and sensory loss

Question 18

CN V

Answer 18

Trigeminal

Question 19

CN VI

Answer 19

Abducens

Question 20

Cn VI function/…

Answer 20

Innervates lateral rectus muscle (eye movement laterally)

Question 21

CN VI clinical signs…

Answer 21

Medial strabismus, diplopia and affected eye drifts to midline

Question 22

CN VII

Answer 22

Facial

Question 23

CN VII function…

Answer 23

Sensory- taste from anterior 2/3 of the tongue, sensation from small area near ear canal
Motor- facial expression, salivation and tear production

Question 24

CN VII travels…

Answer 24

Sensory- 2/3 of anterior tongue
Motor- muscles of facial expression, stapedius, and posterior belly of digastric

Question 25

CN VII clinical signs...

Answer 25

Loss of taste of anterior 2/3 of the tongue, UMN (weakness to contralateral lower face), LMN (weakness to entire ipsilateral face, hyperacusis, dry eye, loss of corneal blink reflex

Question 26

CN VIII

Answer 26

Vestibulocochlear

Question 27

CN VIII function

Answer 27

Serves audition and balance

Question 28

CN VIII clinical signs...

Answer 28

SNHL, vestibular disruption

Question 29

Cn IX

Answer 29

Glossopharyngeal

Question 30

Cn IX function

Answer 30

Sensory- sensation of the middle ear, pharynx, posterior 1/3 of tongue, taste from posterior 1/3 of the tongue, autonomic functions of BP and oxygen pressure Motor- elevates pharynx for talking, swallowing, contributes to gag reflex

Question 31

CN IX travels to

Answer 31

Innervates the stylophryngeus

Question 32

Cn IX clinical signs

Answer 32

Loss of taste to posterior 1/3 of the tongue, diminished gag reflex, reduced pharyngeal elevation while swallowing

Question 33

CN X

Answer 33

Vagus

Question 34

CN X function

Answer 34

Sensory- sensation from pharynx, meninges, small region near ear canal, taste from epiglottis and pharynx Motor- swallowing and phonation

Question 35

CN X travels

Answer 35

Innervation of pharyngeal and laryngeal muscles and palate; innervation to the heart, lungs and digestive tract

Question 36

CN X clinical signs

Answer 36

UMN bilateral (hypernasal speech, weak, breathy voice), LMN unilateral (uvula points to intact side, breathy voice), LMN bilateral (soft palate does not rise, voice is weak and breathy)

Question 37

Cn XI

Answer 37

Spinal accessory

Question 38

CN XI function

Answer 38

Turns head in opposite direction, elevates shoulder

Question 39

CN XI travels

Answer 39

Innervates sternocleidomastoid and upper trapezius

Question 40

CN XII

Answer 40

Hypoglossal

Question 41

CN XII function

Answer 41

Muscles of the tongue

Question 42

CN XII travels

Answer 42

Innervates all intrinsic and extrinsic (except palatoglossus) muscles of the tongue

Question 43

CN XII clinical signs

Answer 43

UMN (contralateral tongue weakness), LMN (ipsilateral tongue weakness and atrophy), neuralgia *Tongue will deviate to the weak side