KOALA. 



Pancreatic Duct. — This usually forms a loop on the 

 right side, passing first down with the duodenum and then 

 up to the left towards the spleen. For its terminal 2 cm. 

 the pancreatic duct dilates into a sac measuring 1 cm. 

 across. Dorsal to this lies the common bile duct in close 

 relation with the wall, so that the most careful dissection 

 is necessary to separate them. A probe passed through 

 the common bile duct, however, shows its distinction from 

 the pancreatic sac. On reaching the wall of the duodenum 

 the pancreatic dilatation narrows and runs like the bile 

 duct obliquely through the wall of gut. They open separ- 

 ately into the interior. These openings are noted at the 

 summit of a papillary projection. This may occasionally 

 be absent and the openings only detected after the passage 

 of fine probes. The common duct is nearly three times the 

 size of the pancreatic duct before the dilatation of the 

 latter takes place. The pancreatic duct measures about 

 13-14 cm. long, and instead of forming a loop on the right 

 it may describe an almost straight course to the left, 

 receiving a well-defined branch from the duodenal portion 

 of the pancreas. This joins the main trunk .5 cm. before 

 the dilatation is reached. 



Pancreas. — On the right side a well-defined vertical 

 process is seen, which may be regarded as the head of the 

 pancreas. Its width in a big specimen was 2.5 cm. It 

 does not fill the duodenal loop, though reaching below 

 almost to its extremity. It is placed in the dorsal part 

 of the meso-duodenum in relation with the ascending 

 pole of the duodenum, and is less mobile than the duo- 

 denal loop. The important feature is that the pancreas 

 on the right side is becoming dorsally fixed and the meso- 

 duodenum is shortening, although the duodenum can be 

 raised off the right lateral lobe of liver and right kidney, 



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