Intermediate Midbrain Quiz

Q1. Which midbrain region lies posterior to the cerebral aqueduct?

• Basis pontis
• Medullary pyramid
• Tectum
• Internal capsule

Q2. Which region lies between the cerebral aqueduct and substantia nigra?

• Crus cerebri
• Tegmentum
• Tectum only
• Corpus callosum

Q3. What surrounds the cerebral aqueduct within the midbrain?

• Pontine nuclei
• Inferior olive
• Caudate nucleus
• Periaqueductal gray

Q4. Where is the oculomotor nucleus located?

• Lateral pons
• Caudal medulla
• Rostral midbrain near the superior colliculus
• Cervical spinal cord

Q5. Where is the trochlear nucleus located?

• Caudal midbrain near the inferior colliculus
• Diencephalon
• Pontomedullary junction
• Rostral medulla

Q6. What is unusual about trochlear nerve fibers before they exit the brainstem?

• They decussate before emerging dorsally
• They join the oculomotor nerve before exit
• They never cross
• They emerge through the medullary pyramid

Q7. Which major descending fibers occupy the crus cerebri?

• Only optic radiation fibers
• Only dorsal column fibers
• Only spinocerebellar fibers
• Corticospinal, corticobulbar, and corticopontine fibers

Q8. Which cerebellar pathway decussates in the caudal midbrain?

• Inferior cerebellar peduncle fibers only
• Middle cerebellar peduncle fibers
• Superior cerebellar peduncle fibers
• Vestibulocochlear nerve fibers

Q9. Which ascending sensory pathway courses through the midbrain tegmentum carrying discriminative touch and proprioceptive information from the body?

• Optic nerve
• Medial lemniscus
• Corticospinal tract
• Fornix

Q10. Which midbrain structure separates the tegmentum from the crus cerebri?

• Substantia nigra
• Inferior cerebellar peduncle
• Superior colliculus
• Cerebral aqueduct