. Anatomy, descriptive and applied. Anatomy. THE MOUTH, ORAL OR BUCCAL CAVITY 1211 the carbonate of calcium, with traces of fluoride of calcium, phosphate of magnesia ami other salts. ' The enamel of a recently erupted tooth is covered by a membrane, tiie thickness of which IS 20^0 mch It is known as enamel cuticle oi- Nasmyth's membrane (ciillnila deniia) It IS probably the remains of the enamel organ, though some consider it the contiruiation of the cementum. The dentin or ivory (substantia eburnca) (Fig. 937) forms the principal mass of the tooth. It represents modified bone, but' differs f
. Anatomy, descriptive and applied. Anatomy. THE MOUTH, ORAL OR BUCCAL CAVITY 1211 the carbonate of calcium, with traces of fluoride of calcium, phosphate of magnesia ami other salts. ' The enamel of a recently erupted tooth is covered by a membrane, tiie thickness of which IS 20^0 mch It is known as enamel cuticle oi- Nasmyth's membrane (ciillnila deniia) It IS probably the remains of the enamel organ, though some consider it the contiruiation of the cementum. The dentin or ivory (substantia eburnca) (Fig. 937) forms the principal mass of the tooth. It represents modified bone, but' differs from the latter in that its cells are upon the siu^ace of the pulp and not In the substance of the dentin. The important parts are: dentinal tubules denlMKil shcntiis, matrix, and dentinal fibres. Till' dentinal tubules are minute canals which have a spiral course, more or less perpendicular to the pulp cavity, and extending from this cavity to the enamel or to the cementum. The diameter at the pulpal end is about ^niVs of an inch, and this diminishes as the tubules branch. The tubules usually end blindly near the enamel; some, however, terminate in the interglobular spaces or anastomose with other tubules. The dentinal tubules contain the dentinal fibres, which represent the pcriplK'iul prijfcsses of the odonto- blastic cells, and their branches follow the divisions of the tubules. The tubule branches are most numerous near the enamel or 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 Gray, Henry, 1825-1861; Spitzka, Edward Anthony, 1876-1922. Philadelphia, New York, Lea & Febiger
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1913
