Cranial Nerves

Question 1

CN I:

Answer 1

OLFACTORY- sensory*, SMELL

Fibers → olfactory bulb → olfactory tract → olfactory cortex

Question 2

CN II:

Answer 2

OPTIC - sensory*, VISION

Retina → optic nerve → optic chiasm → optic tract → thalamus → visual cortex

Question 3

CN III:

Answer 3

OCULOMOTOR - motor*, EYE MOVEMENT

(4 of 6 extrinsic eye muscles + eyelid/pupil)

Question 4

CN IV:

Answer 4

TROCHLEAR: motor*, superior oblique muscle

“Trochlea” = pulley/hook in eye socket

Question 5

CN V:

Answer 5

TRIGEMINAL: both*, FACIAL SENSATION & CHEWING

Largest/most fibers with 3 DIVISIONS:
1. Ophthalmic (top) - sensory
2. Maxillary - sensory
3. Mandibular: both

Question 6

CN VI:

Answer 6

ABDUCENS: motor*, EYE

“Abducts” lateral rectus muscle

Question 7

CN VII:

Answer 7

FACIAL: both* - motor : face, “making faces”, ANS : glands in face, sensory: ant. 2/3 of tongue

5 branches

Question 8

CN VIII:

Answer 8

VESTIBULOCOCHLEAR: sensory*, hearing & equilibrium

Inner ear → medulla/pons

Question 9

CN IX:

Answer 9

GLOSSOPHARYNGEAL: both* - motor: to pharynx, ANS: salivary glands, sensory: post. 1/3 of tongue & pharynx

Question 10

CN X:

Answer 10

VAGUS: both* - motor: to larynx & pharynx, ANS: to viscera, sensory: from viscera

“Wandering nerve”

Question 11

CN XI:

Answer 11

ACCESSORY: motor* - moves SCM & Traps

Cervical spine → up spinal cord into skull → back down into neck

“NECKlace as an accessory”

Question 12

CN XII:

Answer 12

HYPOGLOSSAL: motor*, TONGUE
Medulla ⟺ tongue

Question 13

Mnemonic for cranial nerves:

Answer 13

“On Occassion Our Trusty Truck Acts Funny - Very Good Vehicle Any How”

Question 14

Mnemonic for sensory/motor:

Answer 14

“Some Say Marry Money But My Brother Says Big Brains Matter More”