THE DIGESTIVE SYSTEM 



203 



differ as to the relation of the mucous to the cokimnar cell. Some 

 authorities consider them two different and independent cells. The 

 majority, however, look upon the mucous cell as a speciahzation of the 



Mouths of crypts 



Lymph nodules 



Villi 



Fig. 164. — Surface View of Small Intestine near upper end, showing villi and one solitary 



lymph nodule. X12. (Spalteholz.) 



/ ~ 



I ff^.f Ik fit fx^ ., 



r 





^¥ 







Fig. 165. — Vertical Section through Mucous Membrane of Human Jejunum. X80. 

 (Stohr.) a and h, Artifacts due to shrinkage; c, intestinal crypts (Lieberkiihn); d, 

 obique and transverse sections of crypts; e, stroma;/, epithelium; g, tangentially cut 

 villi; h, muscularis mucosae; i, submucosa. 



