Fig. 13. (A) The acellular Bowman's layer in cross-section and frontal section (inset). Notice the random directionality of the 22-nm diameter collagen fibrils in this portion of the stroma. (B) The anterior third of the cellular corneal stroma in cross-section and frontal section (inset). Notice the thin and more obliquely oriented lamellae in this region of the corneal stroma and its lattice-like arrangement of 25-nm diameter collagen fibrils. (C) The posterior third of the cellular corneal stroma in cross-section and frontal section (inset). Notice the thick and parallel oriented lamellae in this region of the cornea stroma and its lattice-like arrangement of 25-nm diameter collagen fibrils. Also, note the orthogonal nature of lamellae (inset) compared to that in the inset from (B). Bars = 1 μm. (TEM 72,500×.)