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...Csf definition functions the liquid surrounding brain and spinal cord it flows in subarachnoid area space between arachnoid pia matter physical support protection provides a controlled chemical environment nutrient supply waste removal intra extracerebral transport neuroendocrine function formation circulation is formed at choroid plexuses by cells lining ventricles normal blood barrier important fot chemistry results of rate ml day mechanism selective ultrafiltration plasma active secretion epithelial membranes excretion absorption volume production constant occurs villi protruding through dura to venous sinuses bloodstream method sampling traumatic tap damage vessel during specimen collection obtained lumbar puncture interspace l or lower using aseptic technique separated into aliquots for serology microbioloy cell count immediate analysis s precious sample preserve any remaining...