AMI'lTLZA OF VATES. 



391 



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 — Pig. 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 |-in. objective 

 and a compound microscope. 





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Fig. 84.— Longitudinai. Section of the Ampulla ofVatbb, showing the Entrance 

 OF THE Ductus Choledochus and the Duct op Wirsxing ; x 8.4. A and B. — 

 Similar Sections of the Ampulla of Vater in Man. (A and B, after Claude 

 Bernard, 17). xl.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 anastomosinpf 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 regurgitation. 



Dct. Wirsung., Ductus Wirsungianus, aa — 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. 81-83). 



