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The Cerebrospinal Fluid
The cerebrospinal fluid is found in the subarachnoid space, the ventricles and the central canal. It is created through the active transport of certain substances in the blood plasma which is situated inside the choroid plexus. The cerebrospinal fluid is clear, and is similar to the lymph fluid. It is responsible for creating a protective cushioning to the structures within the CNS, or the central nervous system.
Like a floating vessel, the brain rests in the cerebrospinal fluid. The path of the fluid goes through out the CNS, and is drained in the walls of the arachnoid villi (a special set of capillaries in the vein), returning to the circulatory system as a waste.