Figure 6
From: The function and structure of the cerebrospinal fluid outflow system
Electron micrograph of the mesothelial cells lining the arachnoid villus showing empty giant vacuole (V). The vacuole on the right has both basal and apical openings, thus constituting a vacuolar transcellular channel (long arrow). The vacuole on the left has basal opening only (short arrows). SAS: subarachnoid space; L: dura lacuna (reproduced with permission from Tripathi [19]).