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HISTOLOGY . If a section he made vertically through a tooth all the exposedSee also: part or See also: crown is seen to be covered with enamel, which, microscopically, is composed of a number of See also: fine hexagonal prisms arranged at right angles to the See also: surface of the tooth, and formed chiefly of
See also: Bone Cement or Alveolar periosteum crustapetrosa or See also: root-membrane
From See also: Ambrose See also: Birmingham, in See also: Cunningham's Text-See also: Book of Anatomy
.
its various parts, and its structure
.
calcium phosphate with small amounts of calcium carbonate, magnesium phosphate and calcium fluoride, but containing practically no organic See also: matter
.
The enamel rests on the " dentine," of which hard yet elastic substance by far the greater part of the tooth is composed
.
It is made of the same salts as the enamel, but contains in addition a See also: good See also: deal of organic matter and forms a structureless mass through which the fine " dentinal tubes " run from the pulp cavity to the periphery
.
Surrounded by the dentine is the " pulp cavity," which is filled by the tooth pulp, a highly vascular and See also: nervous mass of branched connective tissue cells, which, in a See also: young tooth, has a layer of See also: epithelial cells, the " odontoblasts, " lying close against the See also: wall of the cavity and forming new dentine
.
Slender processes (" Tomes's fibrils ") project from these cells into the dentinal tubes, and are probably sensory
.
A nerve and artery enter the See also: apex of the root of the tooth, but it is not understood how the nerve ends
.
Surrounding the dentine where it is not covered by enamel is the " cement " or " crusta petrosa," a thin layer of bone which is only separated from the bony socket by the alveolar periosteum
.
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