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, 



M 



'VO 



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

 THE HUMAN SUBMAXILLARY GLAND. 



C, interlobular 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 



