During brain vesicle development, the neural canal expands into which structure?

During brain vesicle development, the neural canal expands into which structure?

• A. Lateral ventricle
• B. Fourth ventricle
• C. Primitive ventricle
• D. Central canal

Answer: (C)

As brain vesicles form, the space inside the developing neural tube—the neural canal—expands to create the brain’s first ventricular cavity, called the primitive ventricle. This primitive ventricle is the starting chamber that later differentiates into the full ventricular system: the lateral ventricles form from the telencephalic part of the forebrain, the third ventricle from the diencephalon, and the fourth ventricle from the hindbrain region. The central canal remains as the continuous canal through the spinal cord and brainstem, but the initial expansion of the neural canal is into the primitive ventricle.

As brain vesicles form, the space inside the developing neural tube—the neural canal—expands to create the brain’s first ventricular cavity, called the primitive ventricle. This primitive ventricle is the starting chamber that later differentiates into the full ventricular system: the lateral ventricles form from the telencephalic part of the forebrain, the third ventricle from the diencephalon, and the fourth ventricle from the hindbrain region. The central canal remains as the continuous canal through the spinal cord and brainstem, but the initial expansion of the neural canal is into the primitive ventricle.