Cranial Nerves

Question 1

CNV1

Answer 1

Ophthalmic division of CNV

Question 2

CNV1 - innervation

Answer 2

Upper eyelid
Conjunctiva
Cornea
Skin of the root/bridge/top of the nose

Question 3

CNV2

Answer 3

Maxillary division of CNV

Question 4

CNV2 - innervation

Answer 4

Skin of lower eyelid
Skin over maxilla
Skin of ala of nose
Skin/mucosa of upper lip

Question 5

CNV3

Answer 5

Mandibular division of CNV

Question 6

CNV3 - innervation

Answer 6

Skin over mandible and TMJ

Question 7

CN III - where does it connect with the CNS

Answer 7

At the junction between the midline and the pons

Question 8

CN III - how does it exit the cranial cavity?

Answer 8

Through the superior orbital fissure

Question 9

CN II - contents

Answer 9

Central retinal artery and vein

Question 10

What surrounds CN II

Answer 10

Subarachnoid space

- this space fills with CSF

Question 11

What happens if CN III becomes damaged?

Answer 11

Damage of somatic motor innervation of the following:

MR, SR, IR, IO, LPS

Question 12

CN III nerve palsy

Answer 12

Loss of function of the eye muscles which it innervates

Question 13

CN III eye position

Answer 13

Look out (LR) and down (SO)
- these muscles are still functioning as they are not supplied by CN III

Question 14

CN IV - location

Answer 14

Only nerve which arises from the dorsum of the brainstem

Question 15

CN IV nerve palsy

Answer 15

Loss of function of the eye muscle it innervates: SO

Question 16

When to suspect CN IV palsy

Answer 16

Pt has blurred vision going down the stairs and has trouble looking down

Question 17

CN VI - function

Answer 17

Abduct the eye (supplies LR)

Question 18

CN VI nerve palsy

Answer 18

Loss of function of the eye muscle it innervates: LR

Question 19

CN VI eye position

Answer 19

Medial deviation of the eye