ABDOMEN AND PELVIS 



475 



Determine the number of arcades formed by the superior 

 mesenteric artery before the ultimate intestinal branches are 

 given off. Do these ultimate arteries anastomose with each 

 other I What are ' ' terminal arteries ' ' ! 



The blood supply of the caecum and appendix is derived 

 from the arteria ileocolica. It runs in the terminal part of the 



FIG. 248. 



A. pancreatico 

 duodenalis 



inferior 

 A. colica medic 



A. colica dextra 



A. iliocolica 



Processus vermiformis 



The superior mesenteric artery. The small intestine has been laid over to the left and the trans- 

 verse colon turned upward. (After Gegenbaur, Lehrb. der Anat. des Mcnsch., Leipzig, 1899, 7 Aufl., 

 Bd. ii. p. 277, Fig. MO.) 



mesentery and, as it approaches the ileocaecal junction, gives 

 off four small twigs. Two of these supply the anterior and pos- 

 terior surfaces of the caecum and are known respectively as the 

 anterior and the posterior caecal artery. The anterior caecal 

 artery gives rise to a fold in the peritoneum, which we already 

 know as the plica mesentericocaecalis. The artery to the appen- 

 dix is directed below and to the left, passing behind the terminal 

 portion of the ileum to enter the mesenteriolum processus venni- 



