Cranial Nerves

Question 1

Name the 12 cranial nerves and what fibers they contain.

Answer 1

• CN I Olfactory Nerve: sensory
• CN II Optic Nerve: Sensory
• CN III Oculomotor Nerve: motor,parasympathethic preganglionic
• CN IV: Trochlear Nerve: Motor
• CN V: Trigeminal: sensory and motor
• CN VI: Abducens: motor
• CN VII: Facial: mixed, preganglionic parasympathetic
• CN VIII: Vestibulo-cochlear : sensory
• CN IX: Glossopharyngeal: Mixed; parasympathetic
• CN X: Vagus: sensory, motor, parasympathetic
• CN XI: Accessory: motor
• CN XII: Hypoglossal: motor

Question 2

Which cranial nerves are purely sensory? Which are only motor? Which are mixed? Which contain preganglionic parasympathetic fibers?

Answer 2

• Sensory: I, II, VIII
• Motor: III, IV, VI, XI, XII
• Mixed: V, VII, IX, X
• Parasympathetic: III, VII, IX, X