70 



A MANUAL OF DENTAL ANATOMY. 



positively as to the accuracy of his views, which as yet, 

 however, have not been confirmed by other investigators. 



FIG. 32 ( 1 ). 



Yet another view of the nature of the dentinal fibril is 

 advocated by Klein ("Atlas of Histology," p. 183), who 

 holds that the odontoblasts are concerned only in the forma- 

 tion of the dentine matrix, and that the dentinal fibrils are 

 long processes of the deeper cells, in the above figure, which 

 run up between the odontoblasts and enter the dental canals. 



In a recent paper (Comptes Rendus, 1880,) Magitot also 

 impugns the accuracy of the views ordinarily accepted as to 

 the structure of dentine, denying the existence of any 

 special walls to the tubes, and further arguing that it is 

 undesirable to think or speak of the channels in dried dentine 

 as tubes at all. For, he argues, they are not tubes in the 

 fresh state, seeing that the fibrils are adherent to the 

 matrix and form a part of it, and that they were originally 



( x ) After Magitot. a. Dentinal fibrils. b. Amorphous matrix. 

 c. Odontoblasts. d. Nuclei of odontoblasts. e. Stellate cells. /. Nerve 

 extremities which are continuous with the branched cells. 



