The cerebral aqueduct passes through:

Appeared in: NVS- 2025

Explanation

The cerebral aqueduct, also known as the aqueduct of Sylvius, is a channel that connects the third and fourth ventricles of the brain.
This aqueduct is located within and passes directly through the midbrain (mesencephalon).
It serves as a crucial conduit for the flow of cerebrospinal fluid (CSF) as part of the ventricular system.

Option B: The cerebrum is the largest part of the brain, located superior to the midbrain. It contains the lateral ventricles and the third ventricle, but not the cerebral aqueduct itself.
Option C: The medulla oblongata is the most inferior part of the brainstem, located below the pons and midbrain. The fourth ventricle is situated posterior to the medulla, but the aqueduct is superior to it.
Option D: The pons is part of the brainstem located inferior to the midbrain and superior to the medulla. The fourth ventricle lies posterior to the pons, but the aqueduct is located within the midbrain, superior to the pons.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Neuroanatomy: Location of the Cerebral Aqueduct as background academic context rather than a clinical decision trigger.
The cerebral aqueduct is the narrowest part of the ventricular system, making it a common site for obstruction (aqueductal stenosis).
Blockage prevents CSF from draining from the third ventricle, leading to its accumulation, which causes non-communicating hydrocephalus and a dangerous increase in intracranial pressure.
What if the patient was a newborn with an enlarged head circumference? This could be a sign of congenital aqueductal stenosis, a primary cause of hydrocephalus in newborns, requiring urgent neurosurgical evaluation.

How to Approach the Question

This is a factual recall question from neuroanatomy.
First, identify the anatomical structure in the question: 'cerebral aqueduct'.
Recall the major parts of the brainstem: midbrain, pons, and medulla, and their superior-to-inferior arrangement.
Visualize or recall the path of cerebrospinal fluid (CSF) through the ventricular system.
Remember that the aqueduct is the narrow 'bridge' connecting the third ventricle (in the diencephalon/forebrain) to the fourth ventricle (in the hindbrain). This bridge is the midbrain.
Eliminate the other options based on their anatomical positions relative to the aqueduct.

Concept Tested & Keywords

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E6 Anatomy Applied Ashalatha 4e p. 419-421

E6 Anatomy Grays 43e Vol 1 Part 3 p. 42-44

Practise the full NVS- 2025

Attempt every question from this paper in a timed mock, then review the full solution for each one.