TEETH. PRACTICAL DEMONSTRATION. 



81 



TKANSVERSE SECTION OF FANG OF HUMAN DECIDU- 

 OUS CANINE TOOTH.-DECALCIFIED. 



(Fig. 61.) 

 OBSERVE: 



(L.) 



1. Division into pulp, dentine, crusta petrosa, and perios- 

 teum. 



2. Line of junction of pulp and dentine. (If the elements of the 

 pulp are intact, note the layer of deeply stained odontoblasts next 

 .the dentine. 



FIG. 61. TRANSVERSE SECTION OF FANG OF A DECIDUOUS CANINE TOOTH, DECALCIFIED WITH 

 CHROMIC AND NITRIC ACIDS, AND STAINED WITH PICRO-CARMINE. 



A, B. Line through the dentine indicating the point at which the edges have been made to 

 join after the omission of an intervening portion. This was necessary in order that the different 

 layers might be shown in a single drawing. 



C, D Junction line between the pulp and dentine. 



E, F. Junction line between dentine and crusta petrosa. 



G, G. Odontoblasts of the pulp. 



H, H. Stellate connective-tissue cells of the pulp. 



I, I. Dentinal processes of odontoblasts. 



J, J. Dentinal fibres. 



K, K. Terminal, branching, dentinal fibres. 



L, L Interglobular spaces of dentine. 



M, M. Lacunae of the crusta petrosa. The drawing does not show the periosteal investiture 

 of the crusta. X 400. 



6 



