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Noun. 1. cerebrospinal fluid-clear liquid produced in the ventricles of the brain; fills and protects cavities in the brain and spinal cord. spinal fluid. bodily fluid, body fluid, liquid body substance, humour, humor-the liquid parts of the body.
Summary. The cerebrospinal fluid (CSF) is contained in the brain ventricles and the cranial and spinal subarachnoid spaces. The mean CSF volume is 150 ml, with 25 ml in the ventricles and 125 ml in subarachnoid spaces.CSF is predominantly, but not exclusively, secreted by the choroid plexuses.Brain interstitial fluid, ependyma and capillaries may also play a poorly defined role in CSF secretion.he mean CSF volume is 150 ml, with 25 ml in the ventricles and 125 ml in subarachnoid spaces. CSF is predominantly, but not exclusively, secreted by the choroid plexuses. Brain interstitial fluid, ependyma and capillaries may also play a poorly defined role in CSF secretion.