AND ABDOMINAL VISCERA. 19 
cecum joins the intestine there is a collection of 
these glands known as the Pancreas A sselle. 
moitViFPRNAL ANATOMY OF THE ALIMENTARY 
CANAL AND APPENDICULAR ORGANS. 
Ligature the stomach about one winch to the left of 
the pylorus, and at the esophagus. Remove the 
stomach from the body, cutting through rts walls just 
beyond the ligatures; open wt along the great curvature, 
wash with water and examine. 
I. 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 prece of the small intestine, selecting a 
portion whtch contains one or more Peyer's patches, 
open along the line of the mesentery, 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 foids, 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 V2//z. 
Examine the appearance of a Peyer's patch when 
seen from the inside. 
