DEVELOPMENT OF LIVER AND PANCREAS 



263 



As is well known the duct of the dorsal pancreas does not ])er- 

 sist in Anui'a. However, (ioeppert ('91) and Voftt and "Win"; 

 ('94) ha\'e described several pancreatic ducts in the ventral 

 ])ancreas some of which joined the ductus choledochus or hepatic 

 duct. It is seen from the table that there is considerable ^'ari- 

 ation in the pancreatic duct-system of the urodeles. The com- 

 ])lex system of some forms may be due, as Goeppert suggested, 

 to a later union of the lesser pancreatic ducts with the duodenum 

 or common duct. 



TABLE 4 

 Table of the pancrentic (lucti< in the van'mis urodeles 



Ventral pancreu.-- 



1, joining with ductus clioleiiochus 



1, joininE the two hepatic ducts 



9, 11 formin;; network with ductus 

 choledochus 



2, joining ductus choledochus 

 '. 1, joining ductus choledochus 



\ 3, joining ductus choledochus 

 f 1, joining ductus choledochus 



\ 1, opening near ductus choledochus 



1, opening near ductus choledochus 



2, joining separate hepatic ducts 

 1, joining hepaticocystic duct 

 Several — joining various hepatic 



ducts 

 1. may or may not join ductus 

 choledochus 



The glandular portions of the \'entral and dorsal pancreases 

 fuse as is clearly shown in figure 33. This fusion of the glandular 

 parts takes place inmiediately after the two parts come in con- 

 tact. The union of the two parts is at first only a narrow neck 

 of tissue, which remains small even in adults. 



In a 35 mm. embryo and in smaller ones attention was called 

 to a small part of the ventral i:)ancreas lying below the gall- 

 bladder and separating the li\'er into upper and lower parts. 



The peripheral portion of the liver grows more rapidly and 

 surrounds this part on the outer side. It then has a peritoneal 

 surface only on the medial upper side. This corresponds to 

 Gianelli's intrahepatic portion of the pancreas. However, as 

 stated by Goeppert, the pancreatic and hepatic tissues are 

 always clearly separate. Goeppert ('91) has given a description 



