202 



ELEMENTS OF HISTOLOGY. [chap. xxv. 



Fig. 116. From a Longitudinal Section through 

 a Villus of the Small Intestine. 



. The epithelium of the surface ; b, non-striped 

 muscular fibres. Immediately underneath the 

 epithelium is a basement membrane with oblong 

 nuclei ; the tissue of the villus is made up of a 

 reticulum of cells ; in its meshes are lymph 

 corpuscles. 



As in the stomach, so also 

 in the small and large intes- 

 tine, the mucosa is connected 

 with the outer muscular coat 

 by a loose-textured fibrous sub- 

 mucosa, in which lie the large 

 vascular trunks, and in many 

 places larger or smaller groups 

 of fat cells and lymph cor- 

 puscles. Between the mucosa 

 and submucosa, but belonging 

 to the former, is a layer of 

 non-striped muscular tissue, 

 the inuscularis mucosce. This 

 is in many places composed of 

 inner circular and outer longi- 

 tudinal bundles, but there are 

 a good many places, especially 

 in the small intestine, where 

 only a layer of longitudinal 

 bundles can be made out. 



The tissue of the mucosa is 



vertically and 

 finely striated 

 basilar border. 

 Many cells are 

 goblet cells. 

 Underneath the 

 epithelium is a 

 basement mem- 

 brane, the sub- 

 epithelial endo- 

 thelium of De- 

 bove(seepar.39). 



ig. 117. From a Vertical 

 Section through the Mucous 

 Membrane of the Large 

 Intestine of Dog. 



<OTriilir in estviirfnrp tn arlpnmrl m > Tne m'icosa containing the 



crypts of Lieberkiihn, closely 

 plnivd side by side : each crypt 

 is lined with a layer of columnar 

 epithelium ; mm, muscularis 

 mucoste ; t, submucosa. (Atlas.) 



tissue (Fig. 116), consisting of 

 a reticular matrix with flat- 



