CSF - Cerebrospinal Fluid is no longer relegated to being the "cushion" of the brain. New research has connected the importance of CSF in the glymphatic system and the newly recognized lymphatic vessel system. A new article just published titled "Regulation of cerebrospinal fluid (CSF) flow in neurodegenerative, neurovascular and neuroinflammatory disease", again references the importance of CSF fluid flow.
http://www.ncbi.nlm.nih.gov/pubmed/26499397
UNFORTUNATELY, most research does not discuss how the CSF flow can be encumbered. Want the answers? Please go to www.ccsvi.org -- listen to the Alliance's exclusive interview with Dr. Scott Rosa.
(thanks Alessandro Rasman for sending the link to the new article)

Biochim Biophys Acta. 2015 Oct 21. pii: S0925-4439(15)00314-2. doi: 10.1016/j.bbadis.2015.10.014. [Epub ahead of print] REVIEW