XXV.] 



SMALL INTESTINE. 



2/7 



Villi. 



Glands. 



6. Auerbach's Plexus lies between the muscular coats, but when 

 they are separated it usually adheres 



to the longitudinal coat. The general 

 arrangement of the plexus can be 

 seen with the naked eye (fig. 265). 



(L) The polygonal mesh work of 

 purplish stained fibres, with slight 

 swellings at the points of intersection 

 (fig. 266). 



(H) The meshes are so large that 

 only a part of them comes into the 

 field of view at once. Note the non- 

 medullated nerve-fibres, and at the 

 nodes, groups of nerve-cells. From 

 the plexus numerous fibres are given 

 off to supply the smooth muscle of 

 the intestine. 



7. Ganglionic Cells. In a vertical 

 section of the gut (prepared as in 1) 

 look for groups of ganglionic cells in 

 the submucous coat and others be- 

 tween the t\vo layers of muscular 

 fibres (fig. 267). 



8. Meissner's Plexus. Spread 

 what remains after removal of the 



longitudinal muscular coat on a slip of glass, mucous surface 



FIG. 263. Scheme of the Distribution 

 of Blood-Vessels in the Small In- 

 testine of a Dog. 3/.3f . Muscularis 

 mucossc. 



Fio. 264. Injected Villi of Small Intestine of Rabbit, seen from above and laterally. 

 A. Artery; V. Vein; C. Capillary network. 



uppermost. With a knife gradually scrape away the mucous coat. 



