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 



Enamel pulp. 



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 



