Treatise on human physiology : For the use of students & practitioners of medicine / By Henry C. Chapman. Illustrated with 595 engravings.

  • Chapman, Henry C. (Henry Cadwalader), 1845-1909.
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: Treatise on human physiology : For the use of students & practitioners of medicine / By Henry C. Chapman. Illustrated with 595 engravings. 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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    ample (Fig. 17), it will be observed that there is a cavity within the crown of the tooth which extends into and throngh the fangs opening by a small apertnre at their apices. This space is the pulp cavity, and contains, in the living tooth, the pulp. The tooth will be also seen, from such a section, to consist of three parts, dentine, or ivory, a yellowish-white Fig. 17. substance bordering the pulp cavity, enamel, a harder and whitish substance capping the crown, cement, a translucent bonv-like laver encrusting the roots. Fig. 18. Section of human molar tooth magnifled. (Owex.) The dentine constitutes the great bulk of the tootli. Chemically it con- sists of about twenty-eight parts of animal matter (tooth cartilage), and seventy-two of earthy salts; among the latter arc principally found cal- cium ph<)S}>hatc, some calcium car- bonate, and magnesium pliosphate. When examined with the microscope dentine (Fig. 18) is seen to consist of an amorphous translucent matrix, in which are iinlx'dded mnnerous canals or tubes, Avhose Avails are distinct from the matrix. These latter are the dental or dentinal tubules, and aver- age in diameter at their commencement y^Q mm. {-^i^-q of an inch). The intermediate space between the adjacent tubules is about three times their diameter. The dental tubules open at their inner ends or beginnings into tlie pulp cavity, outwardly tlicy pass to tlie pe- riphery of the tooth. Tlie tubules run generally in a parallel, but Section of fang, parallel to the dentinal tiibuU's (human canine). Magnified SOO diameters. 1. Cement, with large bone- lacunic and indieation.s of lamellfc. 2. (iranular layer of Purkinje (interglobu- lar spaces). 3. Itcutiual tubules. (Wal- DEYKK.)