Cranial Nerves

Question 1

I

Answer 1

Olfactory

SENSORY

• smell (no thalamic relay)
• Cribiform plate

Question 2

II

Answer 2

Optic

SENSORY

• sight
• thru optic canal w/ opthalmic artery

Question 3

III

Answer 3

Oculomotor

MOTOR

• all extra-ocular muscles except LR/SO
• pupil constriction (sphincter pupillae - EWN, muscarinic)
• Accommodation
• Levator palpebrae (opens eyelid)
• Out superior orbital fissure

*** affected by uncal herniation of medial temporal through tentorium

Question 4

IV

Answer 4

Trochlear

MOTOR

• superior oblique
• Out superior orbital fissure (exits dorsally then comes around)

Question 5

V

Answer 5

Trigeminal

SENSORY AND MOTOR

V1 - (sup orbital fissure) opth sensation; afferent of cornea reflex)
V2 - (rotundum) maxillary sensation
V3 - (ovale) mandibular sensation

-Also somatosensory of anterior 2/3 tongue and musc of mastication

Question 6

VI

Answer 6

Abducens

MOTOR

• Lateral rectus
• Out superior orbital fissure

Question 7

VII

Answer 7

Facial

SENSORY AND MOTOR

• Facial movement/expression
• Anterior 2/3 taste
• Lacrimation, salivation (submandibular and sublingual)
• Eyelid closing (efferent arm of cornea reflex)
• Stapedius
• Out internal auditory meatus

Question 8

VIII

Answer 8

Vestibulocochlear

SENSORY

• Hearing and balance
• Out internal auditory meatus

Question 9

IX

Answer 9

Glossopharyngeal

SENSORY AND MOTOR

• Taste and sensation of posterior 1/3 tongue
• Swallowing
• Lacrimation (parotid)
• Carotid sinus receptors
• Stylopharnygeus (elevation of pharynx/larynx)
• Out jugular foramen

Question 10

X

Answer 10

Vagus

SENSORY AND MOTOR

• Supraglottic taste
• Swallowing
• Palate elevation
• Uvula midline
• Talking (larynx)
• Cough reflex
• Aortic arch receptors
• Out jugular foramen

Question 11

XI

Answer 11

Accessory

MOTOR

• SCM and trapezius
• Spinal root goes in thru foramen magnum then back out jugular foramen

Question 12

XII

Answer 12

Hypoglossal

MOTOR

• Tongue muscles
• Out hypoglossal canal