title: The brain's third circulation.
mesh_terms: D001692:Biological Transport; D001921:Brain / Q000502:physiology*; D002552:Cerebral Ventricles; D002555:Cerebrospinal Fluid / Q000502:physiology*; D002831:Choroid Plexus / Q000378:metabolism; D005110:Extracellular Space; D009995:Osmosis