346 DISSECTION OF THE RABBIT. 



mucous membrane, which is raised into irregular 

 longitudinal folds. The pyloric orifice is narrowed 

 by a prominent muscular rim. 



2. The small intestine. 



Cut out a small piece from the wall, and examine its inner 

 surface under water. 



The villi are minute tag-like processes of the 

 mucous membrane, covering its surface, and giving 

 it a velvety appearance. 



Peyer's patches present a honeycombed appear- 

 ance, the depressions being occupied by smooth 

 convex lymph-follicles, and bordered by villi. 



3. The caecum. 



Remove the ccecum from the body in a sink, cutting across 

 the small intestine and the colon about an inch from it. Slit 

 it open longitudinally : wash out its contents thoroughly, and 

 examine under water. 



The inner surface is papillose, and raised along 

 the line of the external constriction into a prominent 

 spiral fold a quarter of an inch or more in width. 

 The opening from the sacculus rotundus is small and 

 circular ; that into the colon is much larger. 



Cut the vermiform appendix across to see the thickness 

 of its wall ; and slit it open to examine its inner surface, which 

 is similar to that of Peyer's patches, but with smaller follicles. 



4. The colon. 



Slit open part of the colon ; wash ; and examine under 

 water, noting the papillose surface and the sacculations of the 

 wall. 



5. The rectum. 



Examine a part of the rectum in a similar manner, and 

 note its smooth mucous membrane. 



