Cranial Nerves

Question 1

Olfactory

Answer 1

(I) Sensory: Smell

Question 2

Optic

Answer 2

(II) Sensory: vision

Question 3

Occulomotor

Answer 3

(III) Motor: Raise eyelids, extraoccular mov’ts.

Parasympathetic: Pupil constriction, changes lens shape

Question 4

Trochlear

Answer 4

(IV) Motor: Downward, inward eye mov’t

Question 5

Trigeminal

Answer 5

(V) Motor: Jaw mov’ts
Sensory: Cornea, iris, lacrima glands, conjuctiva, eyelids, forehead, nose, nose/mouth mucosa, teeth, tongue, ear, facial skin

Question 6

Abducens

Answer 6

(VI) Motor: lateral eye mov’t

Question 7

Facial

Answer 7

(VII) Motor: Facial expression muscles (save jaw), close eyelids, some speech
Sensory: taste (anterior 2/3 tongue), pharynx
Parasympathetic: tear and saliva excretion

Question 8

Acoustic

Answer 8

(VIII) Sensory: Hearing, equilibrium.

Question 9

Glossopharyngeal

Answer 9

(IX) Motor: voluntary muscles of swallowing and phonation.
Sensory: Nasopharynx, gag, taste (post. 1/3 of tongue).
Parasympathetic: carotid reflex, salivary secretion.

Question 10

Vagus

Answer 10

(X) Sensory: Behind ear, portion of external canal.

Parasympathetic: Digestive enzymes, carotid reflex, peristalsis, action of heart, lungs, and GI tract

Question 11

Spinal accessory

Answer 11

(XI) Motor: turn head, shrug, some phonation

Question 12

Hypoglossal

Answer 12

(XII) Motor: Tongue mov’t for speech and swallowing