THE SALIVARY GLANDS 



383 



same manner, the larger number of their secreting alveoli or acini arising 

 through a more complex duct system. 



The larger ducts of the gland are lined by columnar cells, which, 



FIG. 354. CORROSION MODEL OF AN INTERLOBULAR DUCT AND ITS BRANCHES, FROM 

 THE HUMAN SUBMAXILLARY GLAND. 



C, inter lobular duct; D, large intralobular duct; E, small intralobular duct; F, inter- 

 calary duct. X 12. (After Flint.) 



as they approach their termination, become superposed and thus offer 

 a gradual transition to the stratified squamous epithelium upon whose 

 surface they open. The epithelium rests upon a basement membrane 



