358 



PRACTICAL ANATOMY. 



The pulp is that portion contained within the pulp 

 cavity and canal or canals. That part within the former 

 is termed the bulb, and corresponds in general outline 

 to the shape of the tooth, having a cornu or horn for each 

 cusp. That within the canal is termed the radicle, one 

 being found in each root. The pulp is composed of a num- 

 ber of fine blood-vessels, ramifying in a mass of ^delicate 

 connective tissue, and a number of cells. Many of these 



on the outside of the pulp 

 (odontoblasts) have processes, 

 long, delicate prolongations, 

 continued into the dental 

 tubuli. It is the means of nu- 

 trient supply and sensation; 

 it is also essential to the preser- 

 vation of translucency and for 

 the vital resistance of the tooth. 

 On its death, the organ gradu- 

 ally loses its translucency, be- 

 ing devitalized, and becomes 

 discolored and opaque. Such 

 a tooth is, however, not dead, 

 as the cementum, and even 

 perhaps part of the dentine, 

 continues to receive nourish- 

 ment through the peridentium for years. 



The dentine is that hard substance which forms the 

 principal bulk of the tooth, extending from the pulp 

 cavity and canal on the inside to the enamel and 

 cementum on the outside. It is composed of dental 

 tubuli and their contents, imbedded in intertubular tissue, 

 a dense, homogeneous substance. The former are minute 

 tubes, having an external diameter averaging about 

 inch, and internally y^^ inch. They extend 



FIG. 156. SECTION THROUGH A 

 CANINE TOOTH. 



A, cmsta petrosa. with large bone-cor- 

 pnscles ; B, interglobular substance ; C, den- 

 tinal tubules. 



