Identifier: dentalcosmos3118whit (find matches)
Title: Dental cosmos
Year: 1889 (1880s)
Authors: White, J. D McQuillen, J. H. (John Hugh), 1826-1879 Ziegler, George Jacob, b. 1821 White, James William, 1826-1891 Kirk, Edward C. (Edward Cameron), 1856-1933 Anthony, Lovick Pierce, 1877-
Subjects: Dentistry
Publisher: Philadelphia : S. S. White Dental Manufacturing Co
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

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iculum, become solidified into basis-sub-stance, and immediately infiltrated with lime-salts. They claimalso that the enamel-rods are built up by rows of such calcified orpetrified medullary corpuscles, the successive arrangement ofwhich into rows causes the more or less regular appearance of thetransverse strise of Retzius, whereas between the rows longitudinalinterstices will remain, filled, perhaps, with a small amount of cement- 756 THE DENTAL COSMOS. substance, differing in its chemical constitution from the basis-sub-stance of the rods proper, and in its interior holding extremelydelicate fibrillse (Bodeckers enamol-fibers) which branch into thetransverse striae. Being satisfied that the views of these gentlemenare correct, I will simply add a new feature, to make those viewsmore symmetrical,—and, as it occurs to me, it is a feature of consid-erable importance: viz., the changes that take place in the amelo-blasts during the process of the formation of enamel (Fig. 2). Fig. 2.
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First-formed enamel of human foetus, six months.—P. dentine. E, enamel toward the dentine, made upof irregular calcined fields, towaid the periphery of prisms with transverse interruptions. M, medul-lary corpuscles finely granular, from which the enamel-prisms are formed. A, ameloblasts, towardthe enamel breaking up into medullary corpuscles, toward the periphery rebuilt by such corpuscles.A1, irregular ameloblasts torn from their connection with enamel. F, Fibrous connective tissue, chang-ing to medullary tissue. X 800. The ameloblasts, as just stated, split up into rows of finely granu-lar medullary corpuscles, and consequently are reduced considerablyin their size. In fact, it is difficult to find full-sized ameloblasts atthe summit of the enamel-cap, where the production of enamel ismost active, the same as it is impossible to find full-sized odonto- GROWTH OF ENAMEL. 757 blasts at the summit of the papilla, where the formation of dentineis most active. The mutilated ameloblasts

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