334 



THE DIGESTIVE SYSTEM 



tapers in thickness as it approaches the neck of the tooth, in which latter 

 place the last formed enamel is found. 



FIG. 315. A DEVELOPING TOOTH FROM AN INFANT'S JAW. 

 a, papilla; b, crown; c, outer enamel epithelium. Hematein and eosin. Photo. X 65. 



The nucleated bases (originally apices) of the cylindrical cells of the 

 inner enamel epithelium are also marked by a sharp cuticular margin 

 and rest upon the adjacent cells of the enamel pulp, the innermost cells 



