chap, xxv.] SMALL AND LARGE INTESTINE. 



203 



tened large nucleated endotheloid cells and numerous 

 smaller lymph corpuscles. The mucosa of the small 

 and large intestine contains simple gland tubes, the 

 crypts or follicles of Lieberkuhn (Fig. 117); they 

 are placed vertically and closely side by side, extend- 



Fig. 118. From a Vertical Section through a Fold of the 

 Mucous Membrane of the Jejunum of Dog. 



c. The mucosa, containing the crypts of Lieberktihn, and projecting 

 as the villi ; m, muscularis mucogse ; , submucosa. (Atlas.) 



ing from the free surface, where they open, to the 

 muscularis mucosse. These glands possess a large 

 lumen, and are lined with a single layer of columnar 

 epithelial cells, many of them goblet cells. 



271. In the small intestine the tissue of the 

 mucosa projects beyond the general surface in the 

 shape of very numerous fine, longer or shorter, cylin- 

 drical, conical or leaf-shaped villi (Fig. 118). These 

 are, of course, covered with the columnar epithelium 



