AMPULLA OF VATER. 



291 



pulla of Vater, within the walls of the duodenum. The ampulla 

 appears as an oblique elevation on the ectal surface of the duode- 

 num, and receives also the ductus communis choledochus (Fig. 84). 



Preparation Fig. 84. The duodenum should be suspended in 

 95 per cent, alcohol for 2-3 days, or it may be hardened in Muller's 

 fluid (see Frey, A). Then rather thick freehand sections may be 

 made with a razor or a very sharp scalpel. The sections may be 

 studied to advantage with a tripod lens or with a f-in. objective 

 and a compound microscope. 



Vltli 



FIG. 84. LONGITUDINAL, SECTION OF THE AMPULLA OF VATER, SHOWING THE ENTRANCE 

 OF THE DUCTUS CHOLEDOCHUS AND THE DUCT OF WIRSUNG ; x 8.4. A and B. 

 SIMILAR SECTIONS OF THE AMPULLA OF VATER IN MAN. (A and B, after Claude 

 Bernard, 17). x 1.75. 



Explanation of Fig. 84. Ampulla, Ampulla of Vater. The sac-like space in the 

 wall of the duodenum into which open the ductus choledochus and the ductus Wirsungi- 

 anus. The ampulla is not a free space, but is more or less filled by anastomosing processes 

 springing from the walls. The ampulla opens into the duodenum through a single orifice 

 on the summit of a slight papilla. 



Dct. chid, cmn., Ductus choledochus communis, as. The common bile duct. It is 

 seen to have its lumen partly filled with anastomosing processes which allow the bile to 

 flow into the ampulla, but tend to prevent any regurpritation. 



Dct. Wirsung., Ductus Wirsungianus, az Duct of Wirsung. The pancreatic duct 

 emptying into the ampulla of Vater. In the cat it is usually much larger than the duct 

 of Santorini (Fig. 81-88). 



