158 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



odontoblasts, forming the outer surface of the pulp 

 next to the dentin. 



i. The odontoblasts form a continuous layer over 

 the entire pulp surface, being everywhere in contact 

 with the dentin. This layer has been called the 







Z_ Enamel cells. 



Odontoblasts. 



Fig. 1 1 6. A portion of a cross section through a developing tooth 

 (Bohm and Davidoff). The dentin is formed, but has become homo- 

 geneous from calcification. Bleu de Lyon differentiates it into zones 

 (a and b). At .c is seen the intimate relationship of the odontoblasts 

 to the tissue of the dental pulp. 



membrane eboris or the "membrane of ivory." The 

 odontoblasts are mesoderm cells, columnar, some- 

 times club-shaped, with basal nuclei and three 

 kinds of processes, (i) Each cell has one to three 

 long, slender, protoplasmic processes projecting into 



