Cranial Nerves

Question 1

CN I

Answer 1

• Exits: Cribifrom plate
• SD: Sphenoid, frontal, ethmoid
• Sx: Altered sense of smell

Question 2

CN II

Answer 2

• Exits: Optic canal
• SD: sphenoid, occiput
• Sx: Visual changes

Question 3

CN III

Answer 3

• Exits: Superior orbital fissure
• SD: sphenoid, temporal
• Sx: Diplopia, ptosis or accomodation problems

Question 4

CN IV

Answer 4

• Exits: Superior orbital fissure
• SD: sphenoid, temporal
• Sx: diplopia

Question 5

CN V1

Answer 5

• Exits: Superior orbital fissure
• SD: sphenoid, temporal
• Sx: dec sensation to the eyelid & scalp

Question 6

CN V2

Answer 6

• Exits: Foramen rotundum
• SD: sphenoid, temporal, maxillae, mandible
• Sx: Tic Douloureux

Question 7

CN V3

Answer 7

• Exits: Foramen ovale
• SD: Sphenoid
• Sx: dec sensation to the mandible

Question 8

CN VI

Answer 8

• Exits: Superior orbital fissure
• SD: sphenoid, temporal
• Sx: diplopia, estropia

Question 9

CN VII

Answer 9

• Enters Internal acoustic meatus & exits the stylomasoid foramen
• SD: sphenoid, temporal, occiput
• Sx: Bell’s palsy

Question 10

CN VIII

Answer 10

• Exits: Internal acoustic meatus
• SD: sphenoid, temporal, occiput
• Sx: Tinnitus, vertiog, hearing loss

Question 11

CN IX

Answer 11

• Exits: Jugular foramen
• SD: temporal, occiput
• Sx: N/A

Question 12

CN X

Answer 12

• Exits: Jugular foramen
• SD: temporal, occiput, OA, AA, C2
• Sx: HA, arrhythmias, GI upset, resp problems

Question 13

CN XI

Answer 13

• Spinal divisions (C1-C6) enters foramen magnum joins w/ the cranial division & exits jugular foramen
• SD: temporal, occiput
• Sx: tenderness in the SCM or trapezius

Question 14

CN XII

Answer 14

• Exits: hypoglossal canal
• SD: occiput
• Sx: dysphagia