1638 



HUMAN ANATOMY. 



layer of columnar cells directly continuous with those covering the villi. They differ 

 from the latter in being only about half so high (.018 mm. ) and in not presenting the 

 characteristic cuticular border. This last gradually disappears as the cells dip into 



_Goblet-cell 



.Capillary 



Cuticular border 

 of epithelium 



FIG. 1388. 



Lacteal 

 Vein 



Transverse section of single intestinal villus, showing relation of 

 epithelium, stroma, and vessels. X 350. 



Surface view of mucous membrane from 

 end of jejunum showing valvulse conni- 

 ventes. Stippled appearance is due to villi 

 covering folds. Natural size. 



the follicles to become the lining of the glands. Under low magnification the sur- 

 face of the small intestine presents numerous pits, the orifices of the glands, which 

 almost entirely fill the spaces between the bases of the villi ; with the exception of 



FIG. 1389. 



Submucous coat Villi 



Mucosa 



.Submucosa 



gitodinal 



uscle 



Longitudinal section of duodenum ; valvula; conniventes cut across, showing relation of these folds to villi. X 15. 



the an-as immediately over the lymph-nodules, where they are partially pushed aside, 

 thr-M- Clauds an- jnc^cnt in all parts of the intestine. They, however, take no part in 

 absorption, never containing fatty particles during periods in which such substances 



