578 THE INTESTINAL CANAL, BY E. KLEIN AND E. VERSON. 



what obliquely to the surface, generally of equal size through- 

 out, or more frequently swollen at the extremity, and having 

 a diameter of 0'06 0'08 of a millimeter, and a length of O35 of 

 a millimeter. The epithelium lining each tube is a direct con- 

 tinuation of the columnar epithelium of the surface, and in no 

 respect differs from it. 



Fig. 110. 



P 



Fig. 110. Section of the large intestine of a Rabbit. J, crypts of 

 Lieberkuhn ; , epithelium ; b, mucosa ; m, muscularis mucosae ; , 

 submucosa ; R, circular muscular layer ; L, longitudinal muscular 

 layer ; p, peritoneum. 



As regards the distribution of the crypts, they lie in close ap- 

 position in the caecum and colon, whilst in the processus ver- 

 micularis they are generally separated from one another by 

 wider tracts of mucous membrane, and at the same time appear 

 shorter and broader. 



The muscularis mucosce is comparatively feebly developed ; 

 its fasciculi are partially arranged into one internal circular and 

 an external longitudinal layer, which generally decussate at the 

 base of the crypts, but frequently give off numerous smaller 

 fasciculi that penetrate the mucosa between the tubes, to which 

 they hold the same relation as in the small intestine. 



