24 



ANLMAL IMvNTISTRV 



THE PULP. 



The pulp is a piiltaceons sul).stance molded to tlie sliape 

 of the pnlp cavity, consisting of loosely arranged connective 

 tissue, blood vessels, nerves and a limiting membrane 

 (odontogenic membrane) which sends processes through- 

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

 communicates with the alveolo-dental periosteum at the 



''<&/,"','M^ 



Fu;. 7. 

 Arrangement of t!ie 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 

 ])eneath 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 pulp at the apical foramen, and in- 

 termingles intimately with the gun^s at the neck of the 



