454 



The Pancreatic Ducts in the Dog 



C. Communications between the two pancreatic ducts. — In no 

 instance of about 40 determinations was either duct absent. The rela- 

 tion between the ducts was exactly determined in thirty cases, the 



findings being reducible to five types, dia- 

 grammatically represented in Fig, 13; A and 

 B belong to one type but differ in that in A 

 the ductus Wirsungianus has a longer and 

 more tortuous course and joins the main 

 duct nearer its bifurcation. A is more fre- 

 quent than B. This type (A or B) occurred 

 sixteen times in the thirty; type C. ten 

 times; D, once; E, twice; and F, once. 

 When the preliminary examination of the 

 free part of the ductus shows that the duc- 

 tus Wirsungianus is large, type E or F is 

 very probably present, and should be care- 

 fully examined for. 

 In the instance in which the two ducts were not in communication, 

 the pancreas was readily separable into two parts, one passing from near 



Fig. 13. — Cast of the duode- 

 nal part of the ductus Sauto- 

 rini, A, seen from the dorsal 

 side ; B, from the right ; C, 

 from the ventral side. The 

 duodenal wall was stretched by 

 distension of the bowel. 



d.s..: 



A 



C M 





D 



d.W. 



d.S 



Fig. lo. — The terminal parts of the bile and the pancreatic ducts, and the dorsal 

 wall of the duodenum. From dog. Diagrammatic. In A and B the ductus Wir- 

 sungianus joins the main duct from the cauda pancreatis; in C, it joins the duct 

 from the caput pancreatis; and in D it joins the main duct. In E and F the two 

 pancreatic ducts are about equal in size. In F, they do not communicate and each 

 is confined to its embryonal field. 



the pylorus caudalward (caput pancreatis), containing the ductus 

 Wirsungianus,while the other extended cranialward along the duodenum 

 from the lower pancreatic orifice to the pylorus and then bending to the 



