Beginner Trochlear Nerve Quiz

Q1. Which extraocular muscle is innervated by the trochlear nerve?

• Superior rectus
• Lateral rectus
• Superior oblique
• Inferior oblique

Q2. Which cranial nerve number corresponds to the trochlear nerve?

• CN III
• CN VI
• CN V
• CN IV

Q3. What type of fibers does the trochlear nerve carry?

• Somatic motor fibers
• Parasympathetic fibers only
• General visceral sensory fibers
• Special sensory fibers

Q4. Where is the trochlear nucleus located?

• Medulla
• Midbrain
• Pons
• Cervical spinal cord

Q5. At approximately which midbrain level is the trochlear nucleus found?

• Superior colliculus only
• Pontomedullary junction
• Inferior colliculus
• Pyramidal decussation

Q6. Which action of the superior oblique is especially important when the eye is adducted?

• Depression of the adducted eye
• Elevation of the adducted eye
• Abduction as its only action
• Elevation of the abducted eye

Q7. Through which opening does the trochlear nerve enter the orbit?

• Foramen rotundum
• Optic canal
• Inferior orbital fissure
• Superior orbital fissure

Q8. Which statement about the brainstem emergence of CN IV is correct?

• It emerges from the olfactory bulb
• It emerges from the ventral medulla
• It emerges from the dorsal midbrain
• It emerges from the pontomedullary junction

Q9. Which major movement can be impaired by a trochlear nerve palsy?

• Pupillary constriction
• Depression of an adducted eye
• Elevation by superior rectus only
• Abduction of the eye

Q10. Does the trochlear nerve carry parasympathetic fibers to the pupil?

• Yes, through the ciliary ganglion
• No
• Yes, through the otic ganglion
• Yes, through the pterygopalatine ganglion