Principles and practice of operative dentistry . Papillae Fig. 121.—Vertical section of cuspid, human foetus, showing complete closure of the sac. X. Formingbone Meckelscartilage Fig. 125.—Vertical section of molar, human foetus, showing deciduous follicle and complete invaginationof the enamel-organ of the permanent follicle. ? 70. ORIGIN, DEVELOPMENT, AND MORPHOLOGY OF THE TEETH. 33 (Figs. 122, 123, and 124), then evolution goes on without further connec-tion with the parent epithelial layer. The follicles of the permanent teeth (Fig. 125) remain attached to thecord from which they had their
Principles and practice of operative dentistry . Papillae Fig. 121.—Vertical section of cuspid, human foetus, showing complete closure of the sac. X. Formingbone Meckelscartilage Fig. 125.—Vertical section of molar, human foetus, showing deciduous follicle and complete invaginationof the enamel-organ of the permanent follicle. ? 70. ORIGIN, DEVELOPMENT, AND MORPHOLOGY OF THE TEETH. 33 (Figs. 122, 123, and 124), then evolution goes on without further connec-tion with the parent epithelial layer. The follicles of the permanent teeth (Fig. 125) remain attached to thecord from which they had their origin, sink deeper into the embryonaltissues, and take their places beneath the follicles of the deciduous teethwhich they are at a later period to replace. The permanent molar teeth do not have their origin from the epithelialcords of the deciduous teeth. The follicle of the first permanent molarhas its genesis at the posterior end of the epithelial lamina, beyond theorigin of the follicle of the second deciduous molar in a bud deriveddirectly from the epithelial lamina at about the seventeenth week. Thefollicle of the second permanent
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
