Cranial Nerves

Question 1

CN I motor/ sensory

Answer 1

No motor/ olfaction

Question 2

CN I

Answer 2

Olfactory

Question 3

CN II

Answer 3

optic

Question 4

CN III

Answer 4

Oculomotor

Question 5

CN III exam

Answer 5

raises eyelid (levator palpibrae), mediates pupilary constriction, SR, MR, IR, inferior oblique

Question 6

CN II exam

Answer 6

visual acuity, visual fields, pupils

Question 7

CN IV

Answer 7

superior oblique

moves eye down when looking at nose

Question 8

CN VI

Answer 8

lateral rectus muscle

moves eye laterally

Question 9

CN VI name

Answer 9

abducens

Question 10

CN IV name

Answer 10

trochlear

Question 11

CN V name

Answer 11

trigeminal

Question 12

CN V function

Answer 12

sensation: V1-V3
sensory of corneal reflex
motor: temporalis/masseter muscles

Question 13

corneal reflex innervation

Answer 13

sensory CN V, motor CN VII

Question 14

CN VII name

Answer 14

facial nerve

Question 15

CN VII exam

Answer 15

facial symmetry and expression

sensory: taste at anterior 2/3 of tongue

Question 16

CN VII sensory

Answer 16

taste anterior 2/3 tongue

Question 17

CN VIII

Answer 17

Hearing: Weber/Rinne test

balance

Question 18

CN IX name

Answer 18

glossopharyngeal

Question 19

CN IX/X exam

Answer 19

uvula midline
palate rises symmetrically
gag reflex: afferent 9/efferet 10

(CNIX) Innervate sensation of posterior 1/3 tongue

Question 20

CN XII name

Answer 20

hypoglossal

Question 21

CN XII exam

Answer 21

tongue motor

Question 22

CN XI name

Answer 22

spinal accessory

Question 23

CN XI

Answer 23

sternocleidomastoids and trapezius

Question 24

Describe CN III palsy

Answer 24

dilated pupil (due to unopposed action of dilator pupilae muscle), ptosis (paralysis of levator palpabrae), down and out position (paralysis of the superior, inferior and medial rectus and inferior oblique)

Question 25

Give a ddx for trigeminal neuralgia

Answer 25

``` odontogenic infections sinus disease OM acute glaaucoma TMJ dz Herpes zoster ```

Question 26

List 8 conditions that cause facial nerve paralysis

Answer 26

``` Stroke (UMN, below brow) Bell's palsy (LMN, above/below eyebrow) Lyme disease Bacterial: AOM, AOE, mastoiditis Ramsey Hunt syndrome Malignant OM EBV infection ```

Question 27

What is the mgmt of Bell's palsy

Answer 27

Prednisone 1mg/kg x 10d If evidence of HSV add antiviral Eye care

Question 28

How does a vestibular schwanoma present

Answer 28

Asymmetrical sensorineural hearing loss | - Unilateral tinnitus, imbalance, headache, fullness in the ear, otalgia, facial nerve weakness

Question 29

Which nerves are most commonly affected by diabetic cranial mononeuropathy?

Answer 29

· 3rd 6th 7th · Diagnosis of exclusion · Extaocular mononueropathy ® evaluate for DM

Question 30

How does diabetic cranial neuropathy present?

Answer 30

- Acute onset of unilateral retro-ocular, supra-ocular pain, diploplia, and ptosis Often dilated pupil does not accompany the CN III palsey

Question 31

Name 4 conditions that can cause a traumatic CN III pals

Answer 31

``` traumatic: herniation Tumor veertebrobasilar ischemia aneurysm hemorrhage into brainstem ```

Question 32

What is the mgmt of diabetic Cranial Mononeuropathy

Answer 32

patching affected eye antiplatelet Tx analgesia expect resolution within 1 yr