Figure 5From: The function and structure of the cerebrospinal fluid outflow systemScanning electron micrograph of giant vacuole in mesothelial cell lining of the arachnoid villus seen from the apical aspect with passage of tracer material (colloidal suspended Thorotrast), seen here through the natural opening on the apical surface of the vacuole (arrows; reproduced with permission from Tripathi [19]).Back to article page