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That leaves us with the neural tube to form all the rest of the nervous system (ie, the entire CNS). Soon after formation, the neural tube wall begins to thicken and form into three layers. From inner to outer these are:

The Nervous System

• That leaves us with the neural tube to form all the rest of the nervous system (ie, the entire CNS). Soon after formation, the neural tube wall begins to thicken and form into three layers. From inner to outer these are:
• Ventricular layer: This layer lines the lumen and is the source of neurons that will reside in the mantle layer. The remaining cells become ependymal cells (glial cells that will line the lumen).