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Blood Brain Barrier

...  passageway between the circulating blood and the cerebrospinal fluid. The endothelial cells in the BBB restrict the entry of microscopic objects like bacteria and macroscopic molecules into the csf while allowing the diffusion of small hydrophobic substances like the oxygen, carbon dioxide, hormones, electrolytes, protein, and glucose. Protection The blood brain barrier effectively protects  ...

Cerebrospinal Fluid

...  of Sylvius, to the fourth ventricle, foramina of the Magendie and Luschka and the subarachnoid space. To balance the normal volume, the venous sinuses in the arachnoid villi reabsorb some of csf. Composition Normally, 500 ml of cerebrospinal fluid per day is produced. However, because of reabsorption in the arachnoid villi, you can maintain a volume of only 135 to 150 ml. The blood  ...