SMALL INTESTINE 



267 



the large branches of the portal vein which receive the blood from the 

 intestines. 



Lymphatic vessels. The intestinal lymphatics (lacteals) appear as 



Vein. 



Tunica propria. 



Muscularis mucosae. Submucosa. 



FIG. 262. VERTICAL SECTION OF THE Mucous MEMBRANE OF THE HUMAN JEJUNUM. X so. 

 The blood vessels are injected with Berlin blue. The vein of the first villus on the left is cut transversely. 



Villus. 



Intestinal glands. 



Submucosa. 



Muscularis 

 mucosae. Lymph nodules. 



Circular Longitudinal 

 layer. layer. 



of the muscularis. 



FIG. 263. TRANSVERSE SECTION OF AGGREGATE NODULES OF THE SMALL INTESTINE OF A CAT. 

 The crests of four nodules were not within the plane of the section. X 10. 



central vessels within the villi (Fig. 261, B). Each villus usually contains 

 a single lacteal ending in a blind dilatation; sometimes there are two or 

 three which form terminal loops. In some stages of digestion the disten- 



