KOALA. 



width, lies behind the lesser omentum, and on the inner or 

 left side is the oesophagus as it lies in the concavity on the 

 inner margin of the left lobe. The right lateral lobe may 

 project beneath the ventral aspect of the right cystic or 

 be wholly distinct from it. Important relations of the 

 inner part of the ventral surface of the right lateral lobe 

 are the right portion of the stomach and the descending 

 pole of the duodenum, while in a groove near the right 

 margin is the proximal colon. Unlike Macropus, the liver 

 of the Koala extends across the upper abdomen from side 

 to side, being found in the epigastric and right and left 

 hypochondriac regions. 



The Gall Bladder and Ducts. — The gall bladder is an 

 elongated sac placed in the cleft of the cystic or mesial 

 lobe, between the large right and the intermediate portions, 

 both of which are hollowed for its reception, and it is seen 

 both on the dorsal and ventral surfaces. It may project 

 bevond the ventral margin of the liver. It is more mobile 

 than the human gall bladder, since its ventral two-thirds 

 are completely invested by peritoneum, but usually the 

 dorsal third is more fixed, being only partly invested 

 with that structure and held in relationship with the 

 adjacent liver. It measures about 5.7 cm. dorso-ventrally 

 and 2.5 cm. across when moderately distended. In some 

 eases a cervix may be noted, but in others the cvstie duct 

 would appear to arise directly from the sac. 



Cystic Duct. — This is lodged in a depressed groove 

 between the inner side of the large right portion of the 

 cystic lobe, and the dorso-internal portions of the inter- 

 mediate and left portions of the cystic lobe on the left, and 

 it may be necessary to remove parts of these to expose the 

 duet and the dorsal portion of the gall bladder. The duct 

 is closely related to the liver, being invested by peritoneum 

 on the ventral and lateral surfaces only, and in a well 



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