KANGAROOS AND WALLABIES. 



(gastro-hepatic) omentum, and should be compared with 

 the fold (ventral) found in Chameleon, and in the 

 Cheiroptera. 



Portal Vein. — The tirst branch given off is a well 

 defined one on the right to the right lateral lobe. More 

 ventrally on the left is a small branch to the spigelian 

 lobe ; and ventral to that a large branch to the left lateral 

 lobe. It finally terminates in two divisions, one to the 

 right mesial, and a smaller one to the left mesial lobe. 



Pancreas. — If the stomach and duodenum be re- 

 tracted towards the left a well defined portion of pancreas 

 is seen in relation to the mesoduodenum, with its maxi- 

 mum development in the region of the thickened hepatico- 

 pancreatic duct. It is traced upwards towards the liver 

 along the common duct, though not reaching as far as 

 the portal fissure, and may be traced in the lesser omen- 

 tum towards the spigelian lobe. This right portion lies 

 ventral to the inf. v. cava, off which it can be raised, and 

 does not usually descend to the lower part of the duo- 

 denal loop. It is traced to the left behind the stomach as a 

 well defined compact gland, 3 cm. in width, passing above 

 the root of the mesentery in relation to the dorsal abdo- 

 minal wall. On the left of the root it defines the lower 

 boundary of the lesser sac, and lies ventral to the left 

 adrenal gland and upper pole of the left kidney, from 

 which it is free ; and although a fine strand, is continued 

 on to the right or omental process of the spleen, i.e., passes 

 into the lesser sac, the main portion of the pancreas, 

 passes downwards in relation to the left, posterior, or 

 dorsal process of the spleen— on the lieno-mesocolic fold 

 — and is continued to the extremity as a tapering process. 

 This part, though forming an angle with the body of the 

 pancreas, is to be regarded as the true continuation of the 

 gland on the left. 



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