Which ventricular structure is a derivative of the telencephalon?

Which ventricular structure is a derivative of the telencephalon?

• A. Lateral ventricles
• B. Third ventricle
• C. Fourth ventricle
• D. Cerebral aqueduct

Answer: (A)

During early brain development, the forebrain (prosencephalon) divides into the telencephalon and the diencephalon, and the ventricular cavities form within these regions. The telencephalon gives rise to the cerebral hemispheres, and its expanding cavities become the lateral ventricles. That makes the lateral ventricles the derivative of the telencephalon. In contrast, the third ventricle lies within the diencephalon, the fourth ventricle forms in the hindbrain, and the cerebral aqueduct is the midbrain canal connecting the third and fourth ventricles.

During early brain development, the forebrain (prosencephalon) divides into the telencephalon and the diencephalon, and the ventricular cavities form within these regions. The telencephalon gives rise to the cerebral hemispheres, and its expanding cavities become the lateral ventricles. That makes the lateral ventricles the derivative of the telencephalon. In contrast, the third ventricle lies within the diencephalon, the fourth ventricle forms in the hindbrain, and the cerebral aqueduct is the midbrain canal connecting the third and fourth ventricles.