310 



SALIVAEY GLANDS AND PANCREAS 



receives strong confirmation in the fact first observed by Cajal * 

 and since that time repeatedly demonstrated, that the demilunes, 

 like the true serous cells, are provided with 

 a system of intercellular secretory canali- 

 culi by which they are placed in rela- 

 tion with the glandular lumen. Moreover 

 Krause was able to demonstrate that gran- 

 ules of sodium indigo-sulphate were se- 

 creted by these cells, as also by the true 

 serous cells and the striated epithelium of 

 the intralobular ducts. 



The mucus secreting cells examined 

 in the fresh state present a clear highly 

 refractive appearance. They closely re- 

 semble the typical goblet cells, but instead 

 of being isolated among the granular 

 serous cells, they may invest the entire 

 acinus, or even the whole of a small lobule 

 may contain only mucus secreting cells. 



After the customary preparation by 

 fixation and staining, the mucous cells 

 present a coarse basophilic reticulum which 

 occupies the distal portion of 

 the cell. Coarse granules, 



FIG. 252. Mucous ACINI OF 



THE RETROLINGUAL GLAND 

 OF THE RAT. 



The ducts and secretory 

 capillaries have been black- 

 ened, r, demilunes with se- 

 cretory capillaries; s, mucous 

 cells. Golgi method, x 500. 

 (After Kolliker.) 



FIG. 253. DIAGRAM OF THE ARRANGEMENT or THE CELLS IN A MIXED SALIVARY GLAND. 

 a, intralobular duct; a', intercalary duct; 6, serous secreting tubules; c, mucus secret- 

 ing tubules; rf, demilune. (After Krause.) 



* Barcelona, 1889. 



