ABDOMINAL VISCEEA 405 



5. The great omentum is a fold of mesentery loaded with 



fat, covering the viscera behind the liver. It is con- 

 tinuous in front with the falciform ligament. 



Lift up to the great omentum to expose the organs covered 

 by it. 



6. The gizzard is a large firm body, lying immediately 



behind the left lobe of the liver, and imbedded in a 

 deep groove in its substance. 



7. The duodenum is a loop of intestine, lying along the 



right side of the abdominal cavity, and embracing the 

 pancreas. 



8. The intestine forms a convoluted mass in the hinder 



part of the abdomen. 



G. The Alimentary Canal. 



Unravel the intestine by cutting through the mesentery 

 close to it, but taking care not to touch the duodenal loop. 



Note the veins in the mesentery, which collect the blood 

 from the alimentary canal, and converge to form the portal 

 vein, which enters the liver in the notch between its right 

 and left lobes. 



Note also, and preserve, the coccygeo-mesenteric vein, 

 which runs in the mesenterial fold connecting the rectimi with 

 the dorsal wall of the abdomen. 



1, The oesophagus commences at the hinder part of the 



buccal cavity, and runs back through the neck and 

 thorax to the stomach. In the neck it is thin- walled, 

 and dilates behind to form a large bUobed sac, the 

 crop. In the thorax, where it is much narrower, 

 and has thick muscular walls, the oesophagus lies 

 between the lungs and dorsal to the heart. 



2. The stomach, or proventriculus, lies dorsal to the left 



lobe of the liver : it is rather wider than the 

 oesophagus, and has thick glandular waUs, in which 

 the gastric juice is secreted. Attached to the right 



