MUCOUS AND SALIVARY GLANDS. 127 



cation to the main duct of the gland by means of the proper ductlet 

 of each saccule. In the saccules of some glands, the so-called 

 mucous salivary glands, another kind of cell element is seen 

 between the gland cells just described and the wall of the sac, 

 their outer side following accurately the concave boundary of the 

 saccule, their inner side impinging upon the gland cells. They 

 thus acquire a more or less half-moon shape. These demilune 

 cells will be again referred to (page 138). 



Between the saccules are numerous bloodvessels which branch 

 and form a network of capillaries on the outside of each little sac. 



FIG. 62. 





1 



A dissection of the side of the face, showing the Salivary Glands. a. Sub- 

 lingual gland, b. Submaxillary glands with their ducts open ing on the floor 

 of the mouth beneath the tongue at d. c. Parotid gland and its duct, 

 which opens on the inner side of the cheek. 



Numerous nerves are also found, which, according to some ob- 

 servers, have ganglionic cell-connections in the gland substance, 

 and send terminals into the gland-cells direct. 



Although this account of the nerve terminations in the secreting 

 cells of other glands has met with doubt, it is certain that in the 

 lower animals nerve terminals have been traced into gland-cells, 

 and upon physiological grounds, as will presently appear, we are 

 forced to believe that a similar connection must exist in mammalia. 



The ducts are lined with ordinary cylindrical epithelium which 



