2 o8 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



the mucous surface of the cheek. The rest of the 

 duct is lined by two layers of cubical epithelium, 

 which is invested by a firm fibrous coat or tunica 

 propria. The interlobular ducts lie between the 



Acini. 



Fig. 154. Section through salivary gland of rabbit, with injected 

 blood-vessels (Bohm and Davidoff). 



lobules and have much the same histology as the 

 excretory duct, excepting the finer branches where 

 the epithelium becomes simple cubical. The intra- 

 lobular ducts are found inside the lobules and have a 

 simple layer of tall cylindrical cells whose cytoplasm 



