64 PHYSIOLOGY FOR THE LABORATORY. 



be seen later with the compound microscope. In what 

 part of the stomach are they most numerous? 



III. THE WALL OF THE SMALL INTESTINE. 



a. The muscular coat. 



b. The mucous lining. 



c. Look for irregular folds running transversely around the 

 intestine called the valvulae conniventes. What is their use ? 



d. With a magnifying glass examine carefully the sur- 

 face of the mucous lining, until you find small conical 

 elevations, or villi. 



e. Sketch. 



IV. THE WALL OF THE LARGE INTESTINE. 



a. The muscular coat. 



b. The mucous lining. What do you find on this ? 

 Compare with the small intestine. 



D. The Microscopical Structure of the Alimentary Canal. 



Materials. Microscopical slides showing cross-sections of the walls 

 of the stomach, the small intestine, the pancreas, and of the liver. 

 Apparatus. Compound microscope. 



I. THE MICROSCOPICAL STRUCTURE OF THE WALL OF 

 THE STOMACH. 



Examine with the compound microscope a cross-section 

 of the wall of the pyloric end of the stomach. 



Notice : 



a. The muscular coat. 



1. Which way do the fibres extend? 



2. How thick is the coat compared with the thick- 



ness of the entire wall ? 



