Figure 3

Tooth attachment tissue comparisons between the hadrosaurid dental battery (UALVP 56336), a crocodilian (Caiman sclerops), and a lagomorph (Ochotona sp.) (a) hadrosaurid tooth in coronal view; (b) histological thin section of a hadrosaurid maxilla (ROM 00696) in coronal view (image flipped upside down to match dental tissue orientation of the dentary); (c) magnified image of box in (b); (d) magnified image of box in (b), cross-polarized; (e) alligator tooth; (f) histological thin section of crocodilian tooth (Caiman sclerops) in coronal view; (g) magnified image of box in (f); (h) magnified image of box in (f), cross-polarized; (i) hadrosaurid tooth in coronal view; (j) histological thin section of hadrosaurid teeth in transverse view; (k) magnified image of box-k in (j); (l) magnified image of box-l in (j); (m) upper beaver incisor representing a lagomorph incisor, coronal view; (n) histological thin section of a lagomorph incisor (Ochotona sp.) in transverse view; (o) magnified image of box-o in (n); (p) magnified image of box-p in (n). ab, alveolar bone; ac, acellular cementum; am, ameloblasts; cc, cellular cementum; ce, cementum; cej, cemento-enamel junction; crc, coronal cementum; de, dentine; en, enamel; es, enamel space; fi, fibroblast; jb, jaw bone; pc, pulp cavity; pct, periodontal connective tissue; pdl, periodontal ligament; pds, periodontal space; rl, reversal line; sf, Sharpey’s fibers. Red lines in (i) and (m) indicate direction of succeeding histological thin sections. Note: a beaver tooth was used in (m) as the pigmented enamel better demonstrated the cej.