Cranial Nerves

Question 1

Olfactory (3)

Answer 1

1. CN I, Sensory
2. Smell
3. Test = ID odors

Question 2

Optic (3)

Answer 2

1. CN II, Sensory
2. Sight
3. Test = Test Visual Fields

Question 3

Oculomotor (3)

Answer 3

1. CN III, Motor
2. Superior/Medial/Inferior Recti, Inferior Oblique, Levator Palpebrae Superioris
3. Test = H Test, Reaction to light

Question 4

Trochlear (3)

Answer 4

1. CN IV, Motor
2. Superior Oblique
3. Test = Down/In Gaze

Question 5

Trigeminal (3)

Answer 5

1. CN V, Both
2. Sensory: Touch/pain of face; Motor: Muscles of mastication
3. Test = corneal reflex, face sensation, clench jaw

Question 6

Abducens (3)

Answer 6

1. CN VI, Motor
2. Lateral rectus mm
3. Lateral gaze

Question 7

Facial (3)

Answer 7

1. CN VII, Both
2. Sensory = Taste (anterior tongue), Motor = Facial muscles, Autonomic = Facial glands
3. Test = tightly close eyes, smile/show teeth, whistle/puff cheeks, ID taste

Question 8

Vestibulocochlear (3)

Answer 8

1. VIII, Sensory
2. Hearing, Balance
3. Test = Hearing and balance tests

Question 9

Glossopharyngeal

Answer 9

1. CN IX, Both
2. Sensory: Touch/Pain (posterior tongue), Taste (posterior tongue); Motor: Pharynx muscles; Autonomic: Parotid gland
3. Test = Gag reflex, ability to swallow

Question 10

Vagus (3)

Answer 10

1. CN X, Both
2. Sensory: Touch/Pain of pharynx, larynx, bronchi, Taste (tongue/epiglottis), Motor: palate, pharynx, larynx muscles, Autonomic: tharocic/abdominal surgery
3. Test = Gag reflex, Ability to swallow, Say “Ahhh”

Question 11

Accessory (3)

Answer 11

1. CN XI, Motor
2. SCM and Trapezius
3. Test = Resisted shoulder shrug

Question 12

Hypoglossal (3)

Answer 12

1. CN XII, Motor
2. Muscles of tongue
3. Tong protrusion (deviates toward injured side)