68 



THE CONNECTIVE TISSUES 



[CH. V. 



nerves, and large numbers of cells of varying shapes ; on the sur- 

 face in close connection with the dentine is a specialised layer of 



A 



FIG. 93. A, Longitudinal section of a human molar tooth ; c, cement; d, dentine ; e, enamel ; v, pulp- 

 cavity. (Owen.) 

 B, Transverse section. The letters indicate the same as in A. 



cells called odontoUasts, which are elongated columnar cells with a 

 large nucleus at the tapering ends farthest from the dentine. 



Enamel 



Cement 



Lower jaw-bonn 



Dentine. 



Periosteum of 

 alveolus. 



Cement. 



FIG. 94. Preniolar tooth of cat in situ. 



