Fig. 15. Electron micrograph of sagittal section of the inner wall of Schlemm's canal (SC) after perfusion with cationized ferritin (CF) (cynomolgus monkey, × 21,000). Note the labeling of cell membranes with cationized ferritin and the enlarged paracellular route (P).E, endothelial cells of the canal; GV, giant vacuole; S, subendothelial cells of cribriform layer; V, small vacuole. (Epstein DL, Rohen JW: Morphology of the trabecular meshwork and inner wallendothelium after cationized ferritin per-fusion in the monkey eye. InvestOphthalmol Vis Sci 32:160, 1991)