. Chordate anatomy. Chordata; Anatomy, Comparative. TEETH 143 blast and odontoblast layers are pushed farther and farther apart. During the secretion of the dentine, protoplasmic strands from the odonto- blasts are retained within the dentine thus forming the dental canaliculi. The odontoblast cells persist throughout life, and by their continued secretion may in old age entirely obliterate the pulp cavity of the tooth. The crown of the tooth is the first to develop, and for a while the tooth resembles a silver-plated thimble, the thin enamel coating cor- ENAMEL PULP PERMANEhq:, TOOTH. PAPILLA
. Chordate anatomy. Chordata; Anatomy, Comparative. TEETH 143 blast and odontoblast layers are pushed farther and farther apart. During the secretion of the dentine, protoplasmic strands from the odonto- blasts are retained within the dentine thus forming the dental canaliculi. The odontoblast cells persist throughout life, and by their continued secretion may in old age entirely obliterate the pulp cavity of the tooth. The crown of the tooth is the first to develop, and for a while the tooth resembles a silver-plated thimble, the thin enamel coating cor- ENAMEL PULP PERMANEhq:, TOOTH. PAPILLA' â »^p?e!i. Fig. 131.âA section of the jaw of a nine-months human embryo, showing the anlage of a canine tooth. The enamel organ of the permanent incisor is seen on the lingual side of the milk-tooth. (Redrawn after Corning.) responding to the silver plate, the dentine to the underlying metal. As the tooth grows, it increases in length as well as in thickness, adding first a neck and later a root. The opening into the inner pulp cavity becomes more and more restricted as the root elongates until finally only a minute foramen remains to admit blood-vessels and nerves. The nerves grow into the pulp and acquire free terminations among the odontoblast cells. The cement layer is the last to be added. Cement is secreted by bone-cells which penetrate the connective-tissue sac enclosing the 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookpublisherphi, booksubjectanatomycomparative
