THE PANCRKAS 



395 



they possess a much thicker connective tissue coat, in which are also 

 many longitudinal smooth muscle fibers. 



On entering the lobule the duct is immediately transformed into 



FIG. 366. FROM A SECTION OF THE HUMAN PANCREAS, SHOWING SEVERAL LOBULES 

 AND THE BROAD INTERLOBULAR BANDS OF CONNECTIVE TISSUE. 



o, blood-vessel; b, pancreatic islet; c, intralobular duct; d, interlobular duct and 

 accompanying artery. Hematein and eosin. Photo. X 45. 



the intercalary (intermediate; junctional) type; in the pancreas there 

 are no specialized intralobular ducts lined by columnar striated epithe- 

 lium as in the salivary glands. The intercalary ducts are very slender 

 tubules which are lined by low columnar or flattened epithelium. Be- 

 cause of the absence of larger intralobular ducts the intercalary portions 

 are relatively very long and much branched* 



