THE PAROTID GLAND. 



157 



THE PAROTID GLAND. 



The Parotid, Submaxillary , SuUingual, and' B'ueeal Salivary 

 Glands are typical glandular structures, with individual peculiarities 

 only in respect to the cell elements; these vary according to the nature- 

 of the secretion formed in each. 



The parotid is a compound acinous gland, leading from which is a 

 principal duct lined with tall columnar cells which collects the 

 fluid saliva from the different divisions of the organ. 



As the duct penetrates the gland it branches freely, the lumina 

 becoming smaller and the cells shorter as the deeper parts are 

 approached. 



Each terminal duct is in connection with several acini. The con- 

 nective-tissue adventitia of the duct becomes the thin wall of the 



FIG. 107. SECTION OF PART OF THE SUBMAXILLARY GLAND. X 250, 



A. Narrow duct from terminal lobules. 



B. Small duct in T. S. 



C. Small duct in oblique section. 



D. Transversely divided acini, showing large lumen. 



E. Mucus remaining in the lumina. 



F. Striated muscular fibres 



G. Adipose tissue. 



