Cranial Nerves

Question 1

Olfactory

Answer 1

CN 1 Sensory
Origin - Cerebrum
Cribiform plate of Ethmoid bone
Sensation of smell

Question 2

Optic

Answer 2

CN 2 Sensory
Origin - Cerebrum
Optic canal of Sphenoid bone
Vision

Question 3

Oculomotor

Answer 3

CN 3 Motor
Origin - Midbrain
Superior orbital fissure
- Raising eyelid
- Moving eyeball
- Constricting iris
Controlling lens shape

Question 4

Trochlear

Answer 4

CN 4 Motor
Origin - Midbrain
Superior orbital fissure
Eye movement

Question 5

Trigeminal

Answer 5

CN 5 Both
Origin - Pons
V1 - Opthalamic Superior orbital fissure
V2 - Maxillary Foramen Rotundum
V3 - Mandibular Foramen Ovale

Facial sensation
Mastication

Question 6

Abducens

Answer 6

CN 6 Motor
Origin - Pons
Superior orbital fissure
Eye movement- lateral rectus muscle

Question 7

Facial

Answer 7

CN 7 Both
Origin - Pons
Auditory canal (stylomastoid foramen)
Facial movements
Taste from anterior 2/3 tongue
Lacrimation
Salivation
Eyelid closing
Auditory reflex

Question 8

Vestibulocochlear

Answer 8

CN 8 Sensory
Origin - Pons
Auditory canal
Hearing
Balance

Question 9

Glossopharyngeal

Answer 9

CN 9 Both
Origin - Medulla
Jugular Foramen
Taste and sensation of the posterior 1/3 of the tongue
Monitoring of carotid body and sinus chemoreceptors and baroreceptors
Elevation of pharynx and larynx

Question 10

Vagus

Answer 10

CN 10 Both
Origin - Medulla
Jugular Foramen
Taste from supraglottic region
Swallowing
Soft palate elevation
Speech
Cough reflex
Parasympathetic innervation to thoracoabdominal viscera
- Important regulator of pulmonary, cardiovascular and GI systems
Monitoring aorta arch chemo and baro receptors

Question 11

Accessory

Answer 11

CN 11 Motor
Origin - Medulla
Jugular Foramen
Int Branch - joins vagus and participates in innervation of larynx
Head turning
Shoulder shrugging

Question 12

Hypoglossal

Answer 12

CN 12 Motor
Origin - Medulla
Hypoglossal Foramen
Tongue Movement