7: Enamel: Composition, Formation, and Structure | Pocket ...
The rod is shaped somewhat like a cylinder and is made up of crystals with long axes that run, for the most part, in the general direction of the longitudinal axis of the rod (Figure 77; see also Figures 71, C and D; 72; and 73).The interrod region surrounds each rod, and its crystals are oriented in a direction different from those making up the rod (Figure 78; see also Figures 71, C ...