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NCI Dictionary of Cancer Terms

cerebrospinal fluid  listen  (seh-REE-broh-SPY-nul FLOO-id)

  The fluid that flows in and around the hollow spaces of the brain and spinal cord, and between two of the meninges (the thin layers of tissue that cover and protect the brain and spinal cord). Cerebrospinal fluid is made by tissue called the choroid plexus in the ventricles (hollow spaces) in the brain. Also called CSF.

Drawing shows cerebrospinal fluid (CSF) in the brain and spinal cord. Also shown are the ventricles in the brain, where CSF is made.