320 SALIVAEY GLANDS AND PANCKEAS 



vessels part company and the smaller arteries pursue a separate 

 course through the interlobular connective tissue. Thus they 

 reach all portions of the gland and supply capillaries to the intra- 

 lobular connective tissue about the acini. Certain arterial branches 

 also enter the islands of Langerhans and form a specially rich 

 plexus of broad capillaries within these cell groups. The veins 

 return by a similar course. 



The lymphatics are mostly confined to the interlobular tissue, 

 where they are in relation with the blood vessels. 



The nerves are derived from the sympathetic, and occur as small 

 trunks within the interlobular connective tissue. Numerous small 

 ganglia occur in their course. As in the salivary glands the nerves 

 supply the vascular walls. About the secreting acini they form a 

 delicate network of naked fibrils from which end branches pene- 

 trate the basement membrane and terminate upon the secreting 

 cells. Paciniau corpuscles are occasionally found in the inter- 

 lobular connective tissue of the pancreas. 



Resum6. Finally the attention of the student should be speci- 

 ally directed to the presence of the islands of Langerhans, the 

 centro-acinar cells, the very distinct inner and outer zones of the 

 secreting cells, the thick walls of the interlobular ducts, the 

 absence of intralobular ducts except of the intercalary type, and 

 the loose character of the interlobular tissue as the distinguishing 

 characteristics of the pancreas. 



