Kirkes' Handbook of physiology / revised and rewritten by Charles Wilson Greene.

  • Kirkes, William Senhouse, 1823-1864.
Date:
1910
Catalogue details

Licence: Public Domain Mark

Credit: Kirkes' Handbook of physiology / revised and rewritten by Charles Wilson Greene. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    Permanent Teeth. Middle Line of Jaw. Bicuspids or ,^ • t • Molars. Premolars. C^'^' Incisors. True )la 3 Incisors. Canine. Bicuspids or True Premolars. Molars. The age at which each permanent tooth is cut is indicated in this table in years: First molars Incisors Bicuspids or premolars Canines Second molars Third Centrals Laterals First Second wisdoms 6 7 8 0 lO 12 to 14 12 to 15 17 to 25 Structure.—A tooth is generally described as possessing a crown, neck, and root or roots. The crown is the portion which projects beyond the level of the gum. The neck is that constricted portion just below the crown which is embraced by the free edges of the gum, and the root includes all below this. On making longitudinal and transverse sections through its center, figure 61, A, B, a tooth is found to be principally composed of a hard superficial Fig. 60.—Normal Well-formed Jaws, from which the Alveolar Plate has been in great part removed, so as to expose the Developing Permanent Teeth in their Crypts in the Jaws. (Tomes.) material, dentine or ivory, which is hollowed out into a central cavity which resembles in general shape the outline of the tooth, and is called the pulp cavity. The tooth pulp is composed of fibrous connective tissue, blood vessels, nerves, and large numbers of cells of varying shapes. On the surface in