AMPULLA OF VATEE. 



291 



pulla of Yater, 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. 84j. 



Preparation — Fig. 84.— The duodenum should be suspended in 

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

 fluid (see Frey, A). Then rather thick fi'eehand 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. 



Fig. 84. — Longitudinal Section of the Ampulla of Vatee, showing the Entrance 

 OP THE Ductus Choledochus and the Duct op Wiesung ; x 8.4. A and B. — 

 Similar Sections of the Ampulla of Vatee ln 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 Wirsiingi- 

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

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

 on the summit of a slight papilla. 



Dot. chid, cmn., Ductus choledochus communis, nz. — The common bile duct. — It is 

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

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



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). 



