300 



THE DIGESTIVE SYSTEM 



more or less dependent upon the vital properties of the lining 

 epithelium. 



The absorption of the products resulting from the digestion of 

 the starches, sugars, albumins, etc., probably proceeds along similar 

 lines. The peptones enter the epithelium in solution and are then 

 secreted, as albumins and globulins, into the tissue spaces, whence 

 they find their way into the lacteal and capillaries. Thus the lac- 

 teals become widely distended even in the absence of the digestion 

 and absorption of fat. 



THE LAKGE INTESTINE 



The three outer coats of this portion of the alimentary canal 

 are identical in structure with those of the small intestine, with a 



FIG. 245. THE MUCOSA 



)F THE LARGE INTESTINE OF MAN. 



At a, the crypts are in longitudinal section ; at ft, owing to a fold of the mucosa, they 

 are very obliquely cut, some of them being almost in transection. A single solitary 

 nodule of lymphoid tissue is embedded in the superficial portion of the submucosa; c, c, 

 the vascular submucosa. Hematein and eosin. Photo, x 48. 



single exception in the irregular distribution of the outer layer of 

 the muscular coat, which in the large intestine forms three dis- 

 tinct longitudinal ridges or thickenings. At other parts of the 



