324 



THE ABDOMEN AND PELVIS 



and the duodenum, supplying both these structures and anastom- 

 osing with the superior pancreatico-duodenal (p. 296). 



The intestinal arteries form a series of twelve to fifteen 

 branches, which arise from the left side of the superior mesenteric 

 and pass towards the jejunum and ileum. They break up into 

 branches which unite and reunite to form a connected series of 

 arcades, which are more complex in the ileum than in the 

 jejunum (Fig. 101). From the terminal arcades, small branches 

 pass to the mesenteric border of the gut and there bifurcate. 



FIG. 101. A Coil from the lower part of the Ileum. The peritoneum has 

 been partially removed to show the arterial arcades. Observe how the 

 fat in the mesentery overlaps the gut, and compare with Fig. 100. 



In the intestinal wall they run parallel to the circular muscular 

 coat, at first in the subserous, then in the muscular, and finally 

 in the submucous coat. 



The ileo-colic (p. 333), right colic (p. 336) and middle colic 

 arteries (p. 336) are described in connection with the large 

 intestine. 



In dividing the bowel, previous to carrying out an 

 anastomosis, it is advisable to remove less of the mesenteric 

 than of the anti-mesenteric border in order that the retained 

 cut margin may have a good blood-supply. 



The lymph vessels of the jejunum and ileum join the 



