THE RABBIT 201 



apart. Find and notice position of the following things in 

 order: Lungs, heart, diaphragm, liver, stomach, and in- 

 testines. Make a diagram of all the organs exposed. 



(6) Study the diaphragm. Note its structure in differ- 

 ent parts. What use is made of that peculiar arrangement 

 of muscular fibers ? Is the liver attached to the diaphragm ? 

 Describe the liver. How many lobes? Look under the 

 large lobe on the right hand side for a depression in which 

 is located the bile sac. Trace its duct down into the mesen- 

 teries below the liver. Note the shape, location, and size 

 of the stomach. Is it caecal? At the distal end of the 

 stomach find the duodemtm which folds back behind the 

 stomach then runs forward again for some distance. Lift 

 the stomach lightly and study the mesenteries attached to 

 the concave side. Find the pancreas, a light pink, fat- 

 like mass in the mesenteries, in the fold of the duodenum. 

 Trace the duct from the liver to its entrance, about a third 

 of an inch from the origin of the duodenum. Look for 

 the duct of the pancreas further down, beyond the bend. 



(7) Tie the esophagus tightly with a string just above 

 the stomach and cut it above where it is tied. Notice a 

 large blood vessel, which divides going to liver and stomach 

 at the base of liver. Cut the mesenteries near the stomach 

 and the duodenum, and gradually unfold and pull away 

 the alimentary tract. Sketch the stomach (X/4)- Follow 

 the duodenum until it passes insensibly into the small in- 

 testine and thence into the caecum, a large, constricted 

 body, which ends in a thick fingerlike tube called vermi- 

 form appendix. Note the circulatory vessels in the con- 

 striction of the caecum and their connections with the mes- 

 enteries. Measure the caecum. Note the entrance and the 



