Cranial Nerve Lesions

Question 1

Causes

Answer 1

3-12 from brain stem = brain stem pathology
- MS
- TRAUMA
- TUMOURS

Question 2

3, 4 + 6

Answer 2

Non functioning eye

Question 3

CN3

Answer 3

Ptosis
Down and out
Fixed dilated pupil
LEW nuclei dysfunction

Question 4

CN4

Answer 4

Diplopia = looking down
RARE = ALWAYS DUE TO TRAUMA

Question 5

CN6

Answer 5

Adducted eye
Sign of increased ICP

Question 6

CN5

Answer 6

Jaw deviates towards affected side
Loss of corneal reflex
Trigeminal neuralgia (incl. sensory pain/motor jaw pain in V1/V2/V3

Question 7

CN7

Answer 7

Facial drop with NO FOREHEAD SPARING
- Bell’s palsy
- Parotid inflammation

Question 8

CN8

Answer 8

Hearing loss
Loss of balance
Skull change (e.g. Paget’s), compression, middle ear disease

Question 9

CN9 + 10

Answer 9

Impaired gag reflex (+ swallowing, resp, vocal issues)
Jugular foramen lesion

Question 10

CN11

Answer 10

Can’t shrug shoulders/ turn head vs resistance

Question 11

CN12

Answer 11

Tongue deviation towards side of lesion