Intermediate Cerebral Aqueduct Quiz

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

• Tectum
• Tegmentum
• Basis pedunculi
• Internal capsule

Q2. Which major midbrain region lies anterior to the cerebral aqueduct and periaqueductal gray?

• Occipital cortex
• Cerebellar vermis
• Tegmentum
• Tectum

Q3. Which colliculi are located dorsal to the cerebral aqueduct at rostral midbrain levels?

• Mammillary bodies
• Inferior olives
• Gracile tubercles
• Superior colliculi

Q4. Which colliculi are located dorsal to the cerebral aqueduct at caudal midbrain levels?

• Superior olives
• Inferior colliculi
• Cerebral peduncles
• Geniculate bodies

Q5. From which embryonic brain cavity is the cerebral aqueduct derived?

• Telencephalic cavity
• Metencephalic cavity only
• Mesencephalic cavity
• Myelencephalic cavity only

Q6. Which embryonic brain vesicle gives rise to the midbrain surrounding the cerebral aqueduct?

• Mesencephalon
• Myelencephalon
• Diencephalon
• Telencephalon

Q7. Does the cerebral aqueduct normally contain a choroid plexus?

• Yes, but only at its midpoint
• Yes, within the periaqueductal gray
• Yes, along its entire roof
• No, it does not contain choroid plexus

Q8. Which ventricular structures enlarge upstream when the cerebral aqueduct is completely obstructed?

• Fourth ventricle only
• Central canal only
• Both lateral ventricles and the third ventricle
• Subarachnoid space only

Q9. What usually happens to the fourth ventricle in isolated complete aqueductal obstruction?

• It becomes continuous with the lateral ventricles
• It fills with arterial blood
• It is always the first ventricle to enlarge
• It remains relatively normal in size

Q10. Which anatomical feature distinguishes the cerebral aqueduct from the interventricular foramina?

• It connects each lateral ventricle to the third ventricle
• It is paired and located in the frontal lobes
• It is a single midline channel through the midbrain
• It opens the fourth ventricle into the subarachnoid space