I75 MICROSCOPIC ANATOMY OF THE ORGANS. 



swellings showing numerous karyokinetic figures. A capillary 

 plexus of blood-vessels develops around the masses of epithe- 

 lial cells. The columns of cells divide many times, and a 

 lumen is formed in them continuous with that of the duct. 

 The interlobular connective tissue develops in connection with 

 the ingrowing blood-vessels. 



The nerves in the submaxillary are numerous. Some end 

 in Pacinian corpuscles (Krause); some supply the blood-vessels; 

 while most of them terminate in the secreting alveoli. These 

 latter pierce the basement membrane and form a rich arbores- 

 cence around the alveolar cells (Berkley). 



FIG. 132. 



Corrosion specimen of ducts of subimixillary gland of dog. (Flint.) The ducts were 

 injected with celloidin injection mass, and the tissue dissolved away. 



The sublingual gland contains no entirely serous tubules. 

 It is a mixed gland, but in man is in large part mucous. The 

 cells of the intralobular ducts are not striated, as in some of the 

 other glands. The intercalary ducts are narrow, and are lined 

 with a low cubical epithelium. The main ducts are clothed 

 with cylindrical epithelium, and break into many small 

 branches whose walls are made up of cubical cells. These lead 

 to still smaller branches, which end at the demilunes of Gianuz/i 

 in secretory capillaries (Fig. 128). 



The small glands, which are distributed widely over the 

 mouth and tongue, are tubular and branched, sometimes simple, 

 and sometimes compound. The body of the gland is situated 

 always in the submucosa, often extending down between the 

 muscles. 



According to their location, we have : gland uhe labiales, 

 buccales, palatine, linguales, etc. According to their products, 



