Which passageway connects the third and fourth ventricles in the brain?

• A. Interventricular foramen
• B. Cerebral aqueduct
• C. Corpus callosum
• D. Central canal

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the anatomy of the brain's ventricular system. The ventricles are interconnected cavities filled with cerebrospinal fluid (CSF) that help protect and nourish the brain.
2. Step 2: Identify the ventricles involved in the question. The third ventricle is located in the diencephalon, while the fourth ventricle is located between the brainstem and cerebellum.
3. Step 3: Recall the passageway that connects these two ventricles. The cerebral aqueduct, also known as the aqueduct of Sylvius, is a narrow channel that allows CSF to flow from the third ventricle to the fourth ventricle.
4. Step 4: Differentiate the cerebral aqueduct from other structures mentioned in the options. For example, the interventricular foramen connects the lateral ventricles to the third ventricle, the corpus callosum is a bundle of nerve fibers connecting the two cerebral hemispheres, and the central canal is part of the spinal cord.
5. Step 5: Confirm that the cerebral aqueduct is the correct answer based on its anatomical function and location within the ventricular system.