LIVER OF KOALA. 



(PHASCOLARCTOS CINEREUS.) 



Diaphragmatic Surface. — Three lobes are recognised 

 on this aspect, viz., large mesial or cystic, and the right 

 and left lateral lobes. 



Right Lateral Lobe. — This is much smaller than the 

 left lateral — having a greatest length of 9.5 cm., and width 

 (laterally) 6 cm. — and is prolonged downwards into the 

 lumbar region as a pointed extremity. It presents one or 

 several fissures on this aspect. At the basal or attached 

 portion of its inner or left margin we see the hepatic re- 

 lationship of the inf. v. cava, 2 cm. long, the wall of which 

 is usually distinguishable throughout, though in some 

 specimens strands of hepatic tissue may partly occlude 

 this. A portion of the spigelian lobe is seen to the left of 

 the vein. This lobe is separated from the mesial or cystic 

 by a fissure — right lateral — which may extend to the 

 left almost as far as the inf. v. cava. On the other hand, 

 the fissure may extend internally only for 3.5 cm., while 

 between this and the vena cava is liver tissue for 3 cm. 

 In other words, the right lobe and the mesial may be one, 

 apart from an interval of 3.5 cm. The exit of the vena 

 cava practically corresponds to the point of convergence 

 of all three hepatic lobes. 



Mesial or C fistic Lobe is the largest of the three lobes, 

 and in one specimen, where the right lateral lobe was well 

 separated from the cystic, it measures 18 cm. dorso-ven- 

 trally, and 14 cm. laterally. It presents three divisions, 

 viz., a large right portion — small intermediate — and a 

 left portion, usually mesial in size, between the two, al- 



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