CN V

Question 1

Causes is CN V palsy

Answer 1

Central

1. Vascular
2. Tumour
3. Syringobulbia
4. MS

Peripheral

1. Aneurysm
2. Tumour (base of skull, eg acoustic neuroma

Question 2

Loss of sensation all 3 divisions

Answer 2

Lesion at ganglion or sensory root (eg meningioma, fracture of middle fossa)

Question 3

Total loss of sensation in one division, where is the lesion?

Answer 3

Post-ganglionic

Question 4

Loss of pain, preservation of touch

Answer 4

Brainstem or upper cervical cord

Question 5

Loss of touch, but pain preserved

Answer 5

Pontine nucleus lesion