“…The ventricular ''void'' is filled with cerebral spinal fluid (CSF), awash with eCBs (Giuffrida et al, 2004). Cells lining the ventricular system express CB 1 and eCB enzymes (Curtis et al, 2006), which modulate the rhythmic production of CSF (Mancall et al, 1985) and control the eCB levels in the CSF (Ashton et al, 2004).…”