AND ABDOMINAL VISCERA. I9 



caecum joins the intestine there is a collection of 

 these glands known as the Pancreas Asselli. 



B. INTERNAL ANATOMY OF THE ALIMENTARY 

 CANAL AND APPENDICULAR ORGANS. 



Ligature the stomach about one inch to the left of 

 the pylorus, and at the oesophagus. Remove the 

 stomach fran the body, cutting through its walls just 

 beyond the ligatures; open it along the great curvature, 

 wash with water and examine. 



1. The Stomach. The walls of the stomach con- 

 sist of an outer layer of peritoneum, a middle 

 layer of muscle which is thicker at the pyloric end 

 than elsewhere, and an internal layer of mucous 

 membrane. The last layer is connected to the mus- 

 cular wall by sub-mucous areolar tissue, and can easily 

 be pulled or dissected away. The mucous mem- 

 brane is thrown into numerous folds which are es- 

 pecially marked in the cardiac region. 



Cut out a piece of the small intestine, selecting a 

 portion which contains one or more Peyers patches, 

 open along the line of the m-esentery, wash thoroughly 

 and examine. 



2. The Small Intestine. The walls of the small 

 intestine are composed of the same layers as those of 

 the stomach. The mucous membrane is not thrown 

 into folds, but is raised into a number of minute pro- 

 cesses which can be seen better with a magnifying- 

 glass. These processes are set closely together like 

 the pile of velvet ; they are known as the Villi. 

 Examine the appearance of a Peyer's patch when 

 seen from the inside. 



