Abstract
1. The fluid homeostasis of the brain depends both on the endothelial blood–brain barrier and on the epithelial blood–cerebrospinal fluid (CSF) barrier located at the choroid plexuses and the outer arachnoid membrane.
2. The brain has two fluid environments: the brain interstitial fluid, which surrounds the neurons and glia, and the CSF, which fills the ventricles and external surfaces of the central nervous system.
3. CSF acts as a fluid cushion for the brain and as a drainage route for the waste products of cerebral metabolism.
4. Recent findings suggest that CSF may also act as a “third circulation” conveying substances secreted into the CSF rapidly to many brain regions.
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Segal, M.B. The Choroid Plexuses and the Barriers Between the Blood and the Cerebrospinal Fluid. Cell Mol Neurobiol 20, 183–196 (2000). https://doi.org/10.1023/A:1007045605751
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DOI: https://doi.org/10.1023/A:1007045605751