Archive image from page 1279 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( compartments become more perfect, but are never entirely closed in over the crowns of the teeth. During the eruption of the teeth the upper and anterior part of these bony cells is absorbed; subsequently, however, it is re-formed around each tooth when it has taken its final position. 9. Eruption.—Long before the root is completed, the crown, by some force which is not properly understood, but which does not seem to depend on additions to the root, is
Archive image from page 1279 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( compartments become more perfect, but are never entirely closed in over the crowns of the teeth. During the eruption of the teeth the upper and anterior part of these bony cells is absorbed; subsequently, however, it is re-formed around each tooth when it has taken its final position. 9. Eruption.—Long before the root is completed, the crown, by some force which is not properly understood, but which does not seem to depend on additions to the root, is pushed through the top of the tooth-sac, and—the upper and anterior wall of the roomy alveolus having been absorbed at the same time — onwards through the gum until the mouth is reached. Later on, when the tooth has assumed its final position, the alveolus, as already stated, is re-formed, and closely embraces the completed root. 10. After the adamant organs of the deciduous teeth have been formed on the inferior aspect of the dental lamina, as described above, the neck of epithelium by which the lamina is still connected with the surface becomes broken up into a cribriform sheet. Its free posterior border, on the other hand, continues to grow backwards in the tissue of the gum towards the cavity of the mouth (Fig. 971, III. and IV.), and at a later date there appear on its under surface, near the free edge, and behind the several developing milk teeth, the adamant organs—or so-called ' reserve germs '— for the corresponding permanent teeth, which are developed from these in ex- actly the same manner as the deciduous teeth described above. In connexion with the development of the permanent molars, which have no corresponding teeth in the deciduous set, there takes place a prolongation backwards of the posterior extremity of the dental lamina into the tissue of the jaw, behind the last deciduous molar. On the inferior aspect of this prolonga- tion, which has no direct
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