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The central nervous system is the spinal cord and brain, essentially.  It is supported and protected by the spine and the cranium, with extra cushioning and protection provided by the cerebro-spinal fluid.

Answer:

The brain and the spinal cord are wrapped in three protective layers of tissue called the meninges. The cerebral spinal fluid goes between these layers to provide more cushion and protection. It nourishes and protects the nerve tissues of the brain and spinal cord. It also acts as a shock absorber, considering humans move a lot and fall.

Explanation:

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