. Anatomy, descriptive and applied. Anatomy. THE MOUTH, ORAL OR BUCCAL CA VfTY 1213 dermic layers, the ectoderm and mesoderm. From the former the enamel is developed; from the latter the dentinal pulp, dentin, cementum, and peridental membrane. It is customary to view the development of the permanent and temporary teeth as separate studies. The earliest evidence of tooth formation in the human embryo is observed about the sixth week. The epithelium covering the embryonic jaws is seen to rise as a ridge along the summit of each jaw. This ridge is the maxillary rampart of Kblliker and Waldeyer.
. Anatomy, descriptive and applied. Anatomy. THE MOUTH, ORAL OR BUCCAL CA VfTY 1213 dermic layers, the ectoderm and mesoderm. From the former the enamel is developed; from the latter the dentinal pulp, dentin, cementum, and peridental membrane. It is customary to view the development of the permanent and temporary teeth as separate studies. The earliest evidence of tooth formation in the human embryo is observed about the sixth week. The epithelium covering the embryonic jaws is seen to rise as a ridge along the summit of each jaw. This ridge is the maxillary rampart of Kblliker and Waldeyer. A transverse section through the jaw will show the clcwiiidii in lie due lo a liiii-ar and miilincd activity of the germinal epithelial layer; a corresponding c|iithclial growth is seen lo .sink as a liand into the mesodermal tissue beneath. This band is called the dental lamina (jr dental shelf. The local. ?^. Enamel pidp Superficial cells of enamel organ ..Epithelium of oral cavity Basal layer Superficial cells of eitatnel organ 'Enamel pulp -Dentinal papilla Fic 939 —\nlage of the enamel germ con- nected ^ith the oral epithelium by the enamel ledge \ 110 Fig. 940.—First trace of the dentinal papilla. X 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 Gray, Henry, 1825-1861; Spitzka, Edward Anthony, 1876-1922. Philadelphia, New York, Lea & Febiger
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
