Additional file 8: Figure S7. of Ontogeny reveals function and evolution of the hadrosaurid dinosaur dental battery

Histology of the dentine and coronal cementum in a horse. (A) illustration of the major tissues in a horse tooth in longitudinal view. (B) overview image of a transverse section through a horse tooth (ROM 33036). (C) closeup image of the coronal cementum of a horse, which overlies the enamel of the tooth crown. (D) closeup image of the infundibular cementum in a horse showing abundance of cementocytes and occasional vascular spaces, which are surrounded by cementeons. (E) closeup image of coronal cementum under cross-polarized light, showing orientations of Sharpey’s fibers of the periodontal ligament. (F) closeup image of periodontal tissues of a horse. Abbrevations: ab, alveolar bone; cc, coronal cellular cementum; de, dentine; en, enamel; pc, pulp cavity; pd, primary dentine; rl, reversal line; sd, secondary dentine; sf, Sharpey’s fibers. (TIF 8893 kb)