312 



SALIVAEY GLANDS AND PANCREAS 



by their very narrow caliber and low epithelium. They are slender 

 tubules which open on the one side from the acini and on the 

 other into the branched terminals of the salivary ducts. In the 

 parotid the salivary ducts are relatively short as compared with 

 the other salivary glands, but are readily recognized by their stri- 

 ated columnar epithelium, which is deeply colored by acid dyes 

 (eosin, etc.) and are thus sharply distinguished from the secreting 

 cells, which stain poorly with these dyes. 



THE STTBMAXILLARY GLAND. In man and in most mam- 

 mals this organ is a mixed salivary gland ; that of the bear and 

 dog contains the largest, that of man and the apes the smallest 

 proportion of mucus acini (Krause).* 



The serous acini of the submaxillary are shorter and less typ- 

 ically tubular than those of the parotid, and they are lined by 



taller secreting cells. The 

 diameter of the acinus is 

 therefore slightly greater 

 in this gland than in the 

 parotid. Its mucous acini 

 contain a relatively large 

 proportion of demilunes. 



The intercalary ducts 

 are still shorter than in 

 the parotid while the in- 

 tralobular ducts are more 

 prominent in the submax- 

 illary. The interlobular 

 connective tissue is not 

 quite so fine as in the 

 parotid. It contains 

 many sympathetic ganglia 

 of relatively large size. 

 Small Pacinian corpuscles 

 of simple construction are 

 occasionally found in the interlobular connective tissue (Krause). 

 THE SUBLINGUAL GLAND. This is a mucus secreting gland, 

 all of whose acini contain mucous cells though they also contain 

 very many demilunes (serous cells), so that although isolated sec- 

 tions which pass through the larger collections of demilune cells 

 may appear as sections of serous secreting tubules, yet, if examined 



*Arch. f. mik. Anat., 1897. 



FIG. 255. FROM A SECTION OF THE HUMAN SUB- 

 MAXILLARY GLAND. 



In the centre is a small salivary duct, just above 

 which are three mucous acini, the uppermost one 

 possessing a demilune. The other acini are serous. 

 Hematein and eosin. Photo, x 370. 



