. Kirkes' handbook of physiology . th the dentine a specialized layer of cells called odonto-blasts, which are elongated columnar cells with a large nucleus at the taper-ing ends farthest from the dentine. The cells are all embedded in a mucoidgelatinous matrix. The blood-vessels and nerves enter the pulp through a small openingat the apical extremity of each root. A layer of very hard calcareous matter, the enamel, caps the dentine ofthe crown; beneath the level of the gum is a layer of true bone, called thecement or crusta petrosa. The enamel and cement are very thin at the neckof the tooth
. Kirkes' handbook of physiology . th the dentine a specialized layer of cells called odonto-blasts, which are elongated columnar cells with a large nucleus at the taper-ing ends farthest from the dentine. The cells are all embedded in a mucoidgelatinous matrix. The blood-vessels and nerves enter the pulp through a small openingat the apical extremity of each root. A layer of very hard calcareous matter, the enamel, caps the dentine ofthe crown; beneath the level of the gum is a layer of true bone, called thecement or crusta petrosa. The enamel and cement are very thin at the neckof the tooth where they come in contact, the cement overlapping the enamel becomes thicker toward the crown, and the cement towardthe lower end or apex of the root. Dentine or Ivory.—Dentine closely resembles bone in chemical com-position. It contains, however, rather less animal matter. Structure. Dentine is finely channelled by a multitude of delicate tubes,which by their inner ends communicate with the pulp-cavity, and by their.
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