The Inner (Alimentary) Tube and Its Respiratory Derivath 



Oral epithelium. 



Dental lamina 



Papilla 



Enamel Dental 

 organs, groove 



Enamel organs. Necks of enamel organs. 

 C D 



Fig. 36. Diagrams showing the early development of three teeth. (One of the 

 teeth is shown in vertical section.) (Courtesy, Bremer-W eatherford: "A Text-Book 

 of Histology." Philadelphia, The Blakiston Company.) 



odontoblast ' dentinal 



fiber 



Tomes' ameloblast outer epithelium 

 process layer of enamel organ 



Fig. 37. Drawing of small segment of developing incisor from 130 mm. pig 

 embryo to show formation of enamel and dentine. (X 350.) (Courtesy, Patten: 

 "Embryology of the Pig," Philadelphia, The Blakiston Company.) 



