94- 



LABORATORY METHODS OF 



large. The pulp is composed of fibrous tissue, nerve 

 fibers, a semifluid substance and an artery. The ar- 

 tery enters the cavity and breaks up into* capillaries. 

 The nerves supply the tooth substance by the branch- 

 ing method. 



The epiblast and hypoblast, both enter into the com- 

 position of the tooth. The epithelial of the primitive 

 jaw becomes thickened and grows down into the sub- 

 jacent tissue and forms the dental ridge. From the 

 lower outer border of this flask-shaped mass of cells, 



L. S. TOOTH. 



1, enamel; 2, dentine; 3, pulp cavity; 4, neck of the 

 tooth; 5, cementum; 6, pericementum ; 7, apical foramen. 



