THE SMALL INTESTINE. 375 



connective and lymphoid tissue. The follicles of Lieber- 

 kiihn are simple mucous crypts, and are found through- 

 out the mucous membrane of the small intestine ; they 

 are similar in structure to the mucous follicles of the 

 stomach. Brunner's glands are racemose glands im- 

 bedded in the mucous membrane of the duodenum. The 

 solitary glands are found most abundantly in the lower 



FIG. 164. SECTION OF INTESTINE, SHOWING THE VIL.LI. 



The blood-vessels, c, and the lacteals. d, have been injected. The blind ending, or 

 simple loop of the black lacteal, is seen to be surrounded by the capillary net-work of the 

 blood-vessels. 



part of the ileum ; they consist of a delicate, skeletal, 

 interlacing fibrous structure, supporting lymphoid ele- 

 ments. They are grayish bodies, ovoidal in form, and 

 measure from two to three millimetres in diameter ; they 

 are surrounded by villi and mucous follicles. Peyer's 

 patches are formed by aggregations of the solitary gland, 

 forming oval patches twenty to thirty in number, found 

 principally in the lower part of the ileum ; they are 



