THE DIGESTIVE TEACT. 



605 



follicles and patches; the tubular intestinal glands within the 

 territory of a follicle may be either absent or present only in 

 small numbers. In the contracted portions of the intestine, the 

 follicle, protruding as a conical elevation, is overlapped by the 

 surrounding villi ; while in the extended portions the follicle is 

 flattened and the villi stand at a certain distance around it. The 

 longitudinal layer of the muscle of the mucosa is perforated, cor- 

 responding with the extent of the follicle, and surrounds its per- 

 iphery. (See Fig. 259.) 



FIG. 259. SMALL INTESTINE OF A BABBIT. VERTICAL SECTION IN 

 THE LONGITUDINAL Axis. LYMPH-VESSELS INJECTED. 



V, villi ; MM, longitudinal muscle-layer of the mucosa ; F, lymph-follicle ; M, fibrous con- 

 nective tissue; T, circular muscle of the intestine, in transverse section; L, longitudinal 

 muscle of the intestine, in longitudinal section ; P, peritoneum. Magnified 25 diameters. 



(6) The large intestine is similar in structure to the small, but 

 destitute of villi ; its mucosa, being of a myxomatous character, 

 shows elevations and folds arranged in a circular direction. The 

 tubular intestinal glands are larger than in the small intestine. 

 The lymph-tissue is either distributed uniformly in the submu- 

 cous layers, or is accumulated in the follicles, which are, it is 



