DISSECTION OF THE DOG 



39 



The pancreas has two ducts. One, the pancreatic duct of Wirsung (ductus 

 pancreaticus [Wirsungi]), drains the left hmb of the gland, and opens into the 

 duodenum in company with the common bile-duct. The second duct, the 

 accessory duct of Santorini (ductus pancreaticus accessorius [Santorini]) , 

 carries away the secretion from the duodenal or right limb, and opens indepen- 

 dently into the duodenum a short distance (30 to 50 mm.) caudal to the orifice 

 of Wirsung's duct. The two ducts intercommunicate in the interior of the gland. 

 In order to expose the ducts of the pancreas and the termination of the 

 bile-duct, the stomach should be pulled over to the left as far as possible and 

 the duodenum to the right. A dissection must then be carefully conducted 

 between the pancreas and duodenum, in the angle formed by the stomach 



a. gastro-lienalis 



.Ramus (Bsophageus 



a. gastrica sinistra 



a. gastrica dextra 



a. gastro-duodenalis 



\ a. pancreaiico- 

 "^ ~ duodenalis 



a, gastro-epiploica dextra 

 a. gastro-epiploica sinistra 

 Fio. 13. — Coeliac artery : semi-diagrammatic. 



and the adjacent part of descending duodenum. This will also expose the 

 pancreatico-duodenal artery and vein. 



It will be noticed that the ductus pancreaticus is generally quite small, 

 whereas the ductus pancreaticus accessorius is large. Occasionally the ductus 

 pancreaticus opens into the duodenum independently, immediately distal to 

 the orifice of the common bile-duct. 



A. CCELIACA.— The coehac artery is dorsal to the left hmb of the pancreas, 

 and is difficult of dissection from its association with the cceHac gangha and 

 plexus of the sympathetic nervous system. Possibly the easiest way to find 

 the vessel is by following the abeady isolated hepatic artery. 



The coehac artery is a very short vessel which leaves the aorta between the 

 two lumbar parts of the diaphragm. Its branches are the hematic, left gastric, and 

 Sflenic arteries ; the two last-named generaUy arising at the same pomt or 



even from a short common trunk. 



D 4 



