. The chordates. Chordata. 38 Basic Structure of Vertebrates minute foramen at the deep end of the root. The dentinal wall of the pulp-cavity, however, is lined by a thin membrane, the odontoblast layer, consisting essentially of the cells (odontoblasts) which secrete the dentine. Each odontoblast gives off an exceedingly delicate proto- Enamel Dentine. Enamel. Fig. 32. Longitudinal section of the lateral part of the crown of a human molar tooth. (X 240.) (1) Dentinal canaliculi, some extending into the enamel; (2) globules of calcified dentine projecting into the interglobular spaces
. The chordates. Chordata. 38 Basic Structure of Vertebrates minute foramen at the deep end of the root. The dentinal wall of the pulp-cavity, however, is lined by a thin membrane, the odontoblast layer, consisting essentially of the cells (odontoblasts) which secrete the dentine. Each odontoblast gives off an exceedingly delicate proto- Enamel Dentine. Enamel. Fig. 32. Longitudinal section of the lateral part of the crown of a human molar tooth. (X 240.) (1) Dentinal canaliculi, some extending into the enamel; (2) globules of calcified dentine projecting into the interglobular spaces (3). (Courtesy, Bremer: "A Text-Book of Histology," Philadelphia, The Blakiston Company.) plasmic fibril (fiber of Tomes) which occupies the canaliculus of the dentinal tubule which was produced by that cell (Figs. 33, 34). The sensitivity of human dentine to the dentist's drill is probably due to these living fibrils which may act in the manner of nerves. In a normal tooth the dentine remains in intimate relation to the living substance which produced it. There is reason to believe that, so long as the odontoblast cells and their dentinal fibrils are alive, the tooth is better able to resist disease. If the blood-vessels and nerves of the pulp are destroyed, the odontoblasts and their fibrils cannot sur- vive. A "dead" tooth is, therefore, more susceptible to decay. Enamel. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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