THE TEETH. 



79 



tine. The dentirial terminal fibres are in connection with branched 

 cells which occupy the interglobular spaces. 



FIG. 60. -VERTICAL SECTION OF BICUSPID TOOTH. DIAGRAMMATIC. 



A, A. Pulp chamber. 



B, Foramen dentium for entrance of vascular and nervous elements to the pulp. 



C, C, C. Dentine. The lines point to the incremental lines of Salter, imperfectly calcified 

 dentinal stroma. 



D, D. Interglobular spaces in last layer, forming the granular layer of Purkinje. 



E, E. Crusta petrosa or cement substance. 



F, Enamel. The parallel lines are intended to indicate the stripes of Retzius due to the for- 

 mation of the enamal in successive layers. 



G, The cuticula. 



The Enamel. The part of the dentine above the neck of the tooth 

 is protected by a covering of enamel. The enamel consists of prisms 

 from one-six thousandth to one-eight thousandth of an inch in diameter 



