204 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



muscles themselves. The arteries then penetrate 

 to the submucosa where an extensive blood plexus 

 is formed. From this plexus branches pass through 

 the muscularis mucosa and enter the mucosa. Here 



Fig- IS 2 - Section through fundus of cat's stomach. The blood-vessels 

 are injected (Bohm and Davidoff). 



they branch into a fine capillary network which in 

 the small intestine penetrates to the core of the villi. 

 Other branches from this plexus supply the inner 

 portion of the circular muscle layer. 



The veins lie side by side with the arteries. Often 

 two veins accompany one artery. The blood drains 

 into the superior and inferior mesenteric veins; the 

 inferior joins the splenic, and the latter unites with 



