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. -8 



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 . Circular Longitudinal 



mucosse. Lymph nodules. 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- 



