Editing Cerebrospinal fluid (section)

===Reabsorption===
CSF returns to the vascular system by entering the [[dural venous sinuses]] via [[arachnoid granulation]]s.<ref name=GH2005/> These are outpouchings of the [[arachnoid mater]] into the venous sinuses around the brain, with valves to ensure one-way drainage.<ref name=GH2005/> This occurs because of a pressure difference between the arachnoid mater and venous sinuses.<ref name="SAKKA2011"/> CSF has also been seen to drain into [[lymph]]atic vessels,<ref name="pmid15624320">{{cite journal | vauthors = Johnston M | title = The importance of lymphatics in cerebrospinal fluid transport | journal = Lymphatic Research and Biology | volume = 1 | issue = 1 | pages = 41–4; discussion 45 | year = 2003 | pmid = 15624320 | doi = 10.1089/15396850360495682 }}</ref> particularly those surrounding the nose via drainage along the [[olfactory nerve]] through the [[cribriform plate]]. The pathway and extent are currently not known,<ref name="WRIGHT2012" /> but may involve CSF flow along some cranial nerves and be more prominent in the [[neonate]].<ref name="SAKKA2011"/> CSF turns over at a rate of three to four times a day.<ref name=GH2005/> CSF has also been seen to be reabsorbed through the sheathes of [[cranial nerves|cranial]] and [[spinal nerve]] sheathes, and through the ependyma.<ref name="SAKKA2011"/>