. A laboratory manual and text-book of embryology. Embryology. HH -\n(N. Fig. 158.—Section through a portion of the crown of a developing tooth showing the various layers (Tourneux in Heisler). 1, 2, cells of enamel pulp; 3, ameloblast layer of enamel-forming cells; 4, 5, enamel prisms; 6, layer of dentine containing processes of 7, odontoblast cells; 8, cells of dental pulp. as the "nerve" of the tooth. This is composed of a framework of reticular tissue in which are found blood-vessels, lymphatics and nerve fibers. The odonto- blast layer persists throughout life and continues to s
. A laboratory manual and text-book of embryology. Embryology. HH -\n(N. Fig. 158.—Section through a portion of the crown of a developing tooth showing the various layers (Tourneux in Heisler). 1, 2, cells of enamel pulp; 3, ameloblast layer of enamel-forming cells; 4, 5, enamel prisms; 6, layer of dentine containing processes of 7, odontoblast cells; 8, cells of dental pulp. as the "nerve" of the tooth. This is composed of a framework of reticular tissue in which are found blood-vessels, lymphatics and nerve fibers. The odonto- blast layer persists throughout life and continues to secrete dentine so that eventually the root canal may be obliterated. Dental Sac.—The mesenchymal tissue surrounding the anlage of the tooth gives rise to a dense outer layer and a more open inner layer of fibrous connective tissue. These layers form the dental sac (Fig. 159). Over the root of the tooth a layer of osteoblasts or bone forming cells develops, and, the epithelial sheath formed by the enamel layers having disintegrated, these osteoblasts deposit about the dentine a layer of bone which is known as the substantia ossea or cement. The cement layer contains typical bone cells but no Haversian canals. As 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 Prentiss, Charles William, 1874-1915. Philadelphia, London, W. B. Saunders
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