Integrative Systems 



197 



EPIDERMIS \ 



NERVE FIBERS 



Fig. 168. Diagrams of taste-buds in (A) annelid, (B) fish, and (C) man, showing 

 their fundamental similarity. (Redrawn after Fritz Kahn: "Der Mensch," Zurich, 

 Albeit Miiller.) 



Excretory duct 



Wandering cell. 

 / 



— Pigment 

 granules. 



Oval nucleus of 

 ~~" a sustentacula! 



cell. 

 — -Round nucleus 

 of an olfactory 

 cell. 

 Basal cell. 



Sections of olfactory glands. 



Dilated duct. 



Fig. 169. Section perpendicular to the surface of the adult human nasal cavity 

 in its olfactory region. (X 400.) (Courtesy, Bremer: "Text-Book of Histology," 

 Philadelphia, The Blakiston Company.) 



