110 



A MANUAL OF DENTAL ANATOMY. 



insensibly into the bands of the fine network of the inner 

 part, and there is no break of continuity whatever. 



At the surface of the cementum it is more richly cellular, 



FIG. 56 ('). 



and here occur abundantly large soft nucleated plasm 

 masses, which are the osteoblasts concerned in making 

 cementum, and which by their offshoots communicate with 

 plasm masses imprisoned within the cementum. 



(*) Portion of the side of the root of a tooth, the gum and alveolar 

 dental membrane, and the edge of the bone of the alveolus. 



A band of fibres is seen passing over the surface of the alveolus and 

 dividing, some to pass upwards into the gum, others to pass more directly 

 across to the cementum. Numerous orifices of vessels cut across trans- 

 versely are seen between the tooth and the bone. 



