Fig. 7. Zonular fibrils average 10 nm in diameter. Most show a microperi-odicity of 12 nm (arrow) and they frequently appear hollow in cross section (small arrows). (TEM, × 81,600) Inset. C is lens capsule. The dark dots and filaments adherent to each zonular fibril are polysaccharide components preserved by fixatives containing Alcian blue (TEM, × 100,000).