Cranial Nerve Injury

Question 1

Which CN(s) involved in tongue sensation?

Answer 1

👅
upper 1/3: X, IX
lower 2/3: V3

Question 2

Which CN(s) involved in tongue taste?

Answer 2

👅
upper 1/3: X, IX
lower 2/3: VII

Question 3

Which CN(s) involved in tongue motor?

Answer 3

👅
X & XII

Question 4

CN […] injury present with
- loss of forehead & brow movement 🙄
- inability to close eyes, eyelid droop 👁️
- loss of nasolabial folds, mouth droop 🫦

Answer 4

CN VII
(7th)

Question 5

[…] syndrome
Bell’s palsy + sensorineural hearing loss following VZV infection

Answer 5

Ramsay Hunt Syndrome

Question 6

Ramsay Hunt caused by […] infection

Answer 6

Viral (VZV)

Question 7

Which medication is proven to reduce duration of 7th CN palsy ?

Answer 7

Steroids

Question 8

Pupil is higher in affected eye, lack intorsion
Head tilt to contralateral side
CN […] palsy

Answer 8

🙄
4th (VI) Trochlear
# Cant see the floor

Question 9

Unable to abduct eye (look laterally)
Displaced medially
CN […] palsy

Answer 9

< .•. ><.•. >
6th (VI) Abducent

Question 10

Ptosis & “down-and-out” gaze
Characteristic of CN […] palsy

Answer 10

👻
3rd (III) Oculomotor

Question 11

If parasympathetic output of CN III affected
[…] reflex may be diminished

Answer 11

Pupillary light reflex 🔦

Question 12

What are the possible etiologies of CN 3,4,6 palsies?

Answer 12

• Vasculopathic
• Tumor
• (3): aneurysm
• (4): congenital trauma
• (6): cranial pressure

Question 13

Loss of sensation in outer 2/3 of tongue
A. Trigeminal nerve
B. Facial nerve
C. Oculimotor nerve
D. Optic nerve

Answer 13

Trigeminal nerve