I 5 88 



II r: MAN ANATOMY. 



mon with other mucous glands, the sublingual lobules do not possess intralobular 

 tubules lined with the characteristic rod-epithelium. The interlobular ducts subdi- 

 vide into smaller canals which extend within the primary lobules and give off wider 

 passages lined with cubical epithelium. Towards the end of these terminal canals 



Duct 



Mucous alveoli 



Serous alveoli 

 Section of submaxillary gland, showing serous and mucous alveoli. X 270. 



the mucous cells appear, at first isolated or in groups, increasing in numbers until 

 they form the entire lining of the passage and become the secreting elements occupy- 

 ing the tubular alveoli of the gland. The latter vary from .030 .060 mm. in diam- 

 eter, and are clothed with cells averaging .015 mm. high. The condition of the 



FIG. 1349. 



Duct 



Crescents of serous cells 





- :< 



B <>f sutilingtial gland, showing st-nuis cells grouped as crescents. X 270. 



alveoli as n-anls tin- mucus bearing cells varies greatly even in the- same lobule At 

 tiiu.-, ,,u entire primary lobule is ,-, >mp..srd of acini tilled with mucous cells ; at others 

 emptv ami iM.rgrd alveoli alternate, or the depleted acini may predominate. Uncer- 

 tainty a> to the presence of the demilunes also r\i>ts, since these may be absent in 





