1 62 NORMAL HfSTOLOGY AND ORGANOGRAPHY. 



hand they unite with the periosteum of the bony 

 alvoli and the subepithelial tissue of the gum. From 

 the upper portion of the cementum these fibers pass 

 horizontally, some of them directly to connect with 

 the cementum of adjacent teeth and others to 

 mingle with the connective tissue of the adjacent 

 mucous membrane, thus giving a firm support to the 



Muscle fiber 



Periosteum 



Bone of alreolai 



process. 



Peridental mem 

 brane. 



Fig. 1 1 8. Transverse section of peridental membrane in alveolar 

 portion (Noyes). 



gingivus, a condition which becomes of primary im- 

 portance in the mastication of food. The fibrous 

 mat of the gum is usually greater on the lingual side, 

 where food is brought against the gingivus with con- 

 siderable force. If a crown band is extended too far, 

 or if deposits accumulate as in case of uncared-for 



