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Cerebrospinal fluid - definition

clear fluid found surrounding the brain and spinal cord (and in the ventricles of the brain). Cerebrospinal fluid acts as a cushion to protect the brain and spinal cord from damage, is involved in regulating blood flow, and helps to protect the nervous system from toxins and foreign particles.

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2-Minute Neuroscience: Ventricles

Know Your Brain: Ventricles