Daniel G. Eevell 



453 



pearing as it sinks deeper. A short distance caudalward and further 

 under the pancreas from this point where the ductus choledochus disap- 

 pears (1-2 cm. from the entrance of the latter into the bowel wall) the 

 ductus Wirsungianus may be found. Its free part is 3-5 mm. long and 

 usually 0.5-1 mm. wide. It may be known from a blood-vessel by its 

 fixity, by its whiteness (or other color when artificially injected from 

 the main duct) also by its sinking into the bowel wall and forming there 

 a whitish area. It usually runs cranio-dextralward. 



(iii) Duodenal part 

 of ductus Wirsungianus 

 (Fig. 11, D, E,F) is 3-5 

 mm. long, varies greatly 

 in its direction, but gen- 

 erally runs cranio-dex- 

 tralward at first, then 

 curves so as to be par- 

 allel with the ductus 

 choledochus. Its termi- 

 nal part is very similar 

 to that of the ductus 

 Santorini (q. v.). 



Casts of the lumen of 

 the main duct often 

 show numerous small 

 knobbed projections 

 from the surface. These 

 can be best seen in in- 

 jected sections. They 

 are due to the small glands in the duct wall. 



It will be seen (Figs. 1, 2, 8, 9, 10) that there is necessarily a close 

 correspondence between the form and size of the ducts and the shape 

 and lobulation of the gland. The gland and the main ducts are long: 

 the gland is narrow and the largest duct branches are relatively short; 

 the lobes and lobules are very various in size, as are also the duct 

 branches. 



It may also be 9bserved (Figs 5 and 6) that the free and duodenal 

 parts of the ducts run outward from under the pancreas. Or stating 

 this fact from the standpoint of development, and considering the ducts 

 to run from the bowel, the two ducts are directed toward each other as 

 they go to the pancreas, this direction giving a reminiscence of the 

 approaching, crossing and fusing of the. two original parts of the gland. 



/> 



B 



Fig. 11. — Celloidin casts of tbe duodenal part of 

 the ductus choledochus (A, B and C) and of the duc- 

 tus Wirsungianus (D, E and F), made with the duode- 

 num distended. C and D, ventral aspect; B and E, 

 seen from the left; A and F, dorsal aspect. The 

 scale-lilie appearance in A, B and C is due to the 

 crypts. 



