. Anatomy, descriptive and surgical. m withthe deepest layer of cells of the oral epithelium, become elongated, and form a layerof well-marked and regular columnar epithelium coating the papilla. These arenamed the internal enamel epithelium. The outer layer of cells of the enamel- THE TEETH. 847 germ, which are in contact with the inner surface of the dentinal sac, presently tobe described, are much shorter, cubical in form, and are named the external enamelepithelium. All the intermediate round cells of the enamel-germ between these twolayers undergo a peculiar change. They become stellate i
. Anatomy, descriptive and surgical. m withthe deepest layer of cells of the oral epithelium, become elongated, and form a layerof well-marked and regular columnar epithelium coating the papilla. These arenamed the internal enamel epithelium. The outer layer of cells of the enamel- THE TEETH. 847 germ, which are in contact with the inner surface of the dentinal sac, presently tobe described, are much shorter, cubical in form, and are named the external enamelepithelium. All the intermediate round cells of the enamel-germ between these twolayers undergo a peculiar change. They become stellate in shape, and their pro-cesses unite to form a network which resembles gelatinous connective tissue. While these changes have been going on the two horns of the semilunar mass,before spoken of as embracing the enamel-germ, and from which the papilla wasderived, extend upward, surrounding the rudimentary tooth and becoming convertedinto a vascular membrane, constituting a sac—the dentinal sac—which encloses the Fig. 560. Fig.
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