Diagram showing the basic organization and structure of enamel rods. The enamel rod is a thin structure extending from the denti-noenamel junction to the surface of the enamel. Where the enamel is thickest, at the tip of the crown, the rods are longest, measuring up to 2,000 /xm. On cross section, the rods reveal a keyhole shape. The upper ballooned part of the rod, called the head, is oriented superiorly, and the lower part of the rod, called the tail, is directed interiorly. Within the head, most of the enamel crystals are oriented parallel to the long axis of each rod. Within the tail, the crystals are oriented more obliquely.
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