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Fig. 4 | BMC Evolutionary Biology

Fig. 4

From: Ontogeny reveals function and evolution of the hadrosaurid dinosaur dental battery

Fig. 4

The internal anatomy of the hadrosaurid dental battery. a artist’s reconstruction of a portion of the maxillary dental battery, with cutaways in the transverse and coronal planes. For completely labeled reconstruction, see Additional file 3: Figure S2 (illustration by D. Dufault). b magnified image of the junction between primary alveolar bone and the remodelled bone of the jaw. c magnified image of the resorptive front created by the younger teeth within a vertical stack of teeth (direction of resorption indicated by black arrows). d magnified image of the attachment site between the teeth and wall of the socket (direction of periodontal ligament fibers indicated by black arrows). The birefringence in the cellular cementum is caused by the parallel orientations of the Sharpey’s fibers. e magnified image of the occlusal end of the dental battery in thin section showing teeth at various stages of wear. f image of a tooth within the battery in transverse section. ab, alveolar bone; ac, acellular cementum; cc, cellular cementum; de, dentine; en, enamel; Li, lingual; Me, mesial; pc, pulp cavity; ppc, plugged pulp cavity; rl, reversal line

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