24 ANIMAL DENTISTRY. 



THE PULP. 



The pulp is a pultaceous substance molded to the shape 

 of the pulp cavity, consisting of loosely arranged connective 

 tissue, blood vessels, nerves and a limiting membrane 

 (odontogenic membrane) v\rhich sends processes through- 

 out the entire length and course of the dentinal tubules, and 

 communicates with the alveolo-dental periosteum at the 



Fig. 7- 

 Arrangement of the Dental Tissues in an Incisor. 



1. Internal enamel surrounding the infundibulum. 



2. Pulp. 



3. Dentine. 



4. External enamel. 



apical foramen. The pulp itself acts as a support for the 

 blood vessels and nerves while the odontogenic membrane 

 is concerned in tooth construction. In the teeth of herbivora 

 it is constantly depositing dentinal substance in the tubules 

 beneath the table surface to destroy the sensibility of the 

 wearing dentine. 



ALVEOLO-DENTAL PERIOSTEUM. 



The alveolo-dental periosteum is a dense, tough mem- 

 brane consisting chiefly of white fibrous tissue and osteo- 

 blasts. It covers the entire fang, communicates with the 

 limiting membrane of the ptilp at the apical foramen, and in- 

 termingles intimately with the gums at the neck of the 



