PLATE XVI. 



Gland 



Musciifaris mticosse 



Duct of Brunner's 

 gland 



Br tinner's gland 

 Blood-vessel 



Circular muscle layer 



Ganglion cells of, 

 A uerbach's plexus 



Longitudinal muscle 

 layer 



111 



FIG. 140. From a longitudinal section t.liroiili tin- duodenum of a cat. X 34. 



