I.] DISSECTION OF A RABBIT AND OF A DOG. 3 



having a shallow spiral constriction around it, 

 the rather thick-walled, light coloured appendix 

 proceeding from the end of the caecum, the 

 large intestine of much smaller diameter than 

 the ca3cum, much puckered in the first part of 

 its course, less puckered in its median portion, 

 and becoming soon quite smooth and passing 

 without change into the rectum. The latter 

 part of the large intestine and the rectum usually 

 contain balls of faeces. 



4. Trace out the mesentery which supports the 

 intestine ; observe its continuity with the peri- 

 toneum or membrane lining the abdominal 

 cavity, note the manner in which the blood- 

 vessels run in it. 



Observe in the dog the loose fold of mesentery 

 loaded with fat, hanging from the lower border 

 of the stomach and forming the great omentum. 



5. Observe the spleen, an elongated dark red body 

 lying near the broad end of the stomach to 

 which it is attached by a mesenteric fold (gastro- 

 splenic omentum). 



6. Turn the stomach over to the left 1 , gently stretch 

 out the duodenum and observe in the mesentery 

 belonging to it, the diffuse, pale-red pancreas ; 

 trace the entrance of the pancreatic duct as a 

 pale thin band into the duodenum : this occurs 

 rather more than a foot below the pylorus, where 

 the duodenum turns back on itself to form a loop. 



1 Right and left are used throughout for the right and left of tho 

 animal. 



1-2 



