453 



The Pancreatic Ducts in the Dog 



Towards the base of the latter it is broadened in the plane of the muscle 

 layers; the papillary part rises at an obtvise angle and tapers to the 

 orifice. 



Ductus pancreaticus accessorius [Ductus Wirsungianus). — (i) Intra- 

 glandular part lies in the right-hand part of the epiduodenal (vide 

 summary) part of the pancreas, being directed cranio-dextralward, i. e. 

 as if it came from the caput pancreatis. It is 1-5 cm. long and has as a 

 rule the form of a side-channel from the main duct to the bowel (vide 

 infra, Communications). It receives several branches, some medium- 



• Fig. 10. — A lobar duct, showing dichotomous branching throughout. From 

 pancreas of dog. 



sized, but most are small. It is narrower in its middle part and wider 

 towards its ends. It is like an interlobular duct and cannot be dissected 

 out as clean and free as the axial ducts. 



(ii) Free part of ductus Wirsungianus is to be sought on the right 

 side of the duodenum. It is hidden under the pancreas and the best 

 guide to it is the ductus choledochus. This passes under the pancreas 

 for some distance before sinking into the duodenum, and is readily 

 distinguished by its dusky orange-brown color, due to the bile in it and 

 the vascularity of its walls. Its duodenal part shines through the 

 bowel wall and can be traced nearly to its end, fading and finally disap- 



