DEVELOPMENT OF THE TEETH IN MAMMALIA 17 



The breaking up of the dental lamina and the connecting 

 bridges gives rise to little separated portions or islands of 

 epithelium, the so-called ' glands of Serres ' (20). As will be 

 shown, however, in discussing the structure of the follicle Connoct- 

 (p. 311), the remains of the epithelial bridges or necks of the blf.i, es 







FIG. 1. Diagrams illustrating development of mammalian teeth (adapted 

 from Gegenbaur). ep. Epithelium of mouth; /. furrow (not always 

 present); I dental lamina or tooth- band ; V. its continuation to form 

 the permanent tooth ; eo. enamel organ cells ; ex. epithelium ; s stellate 

 reticulum ; e. enamel ; a. ameloblasts ; d. dentine ; p. papilla ; b. bone ; 

 m. germ of permanent tooth : c. capsule. 



enamel organ do not all atrophy there is also a prolifera- 

 tion and further development of these cells which takes 

 place within the connective tissue of the follicle. 



On the surface of the epithelium of the jaw is a shallow Tooth 

 groove, the ' tooth furrow ', which marks the connexion of 

 the tooth-band with the oral epithelium ; this furrow runs 



furrow . 



