The Intestines. 193 



The proximal branches include: 



( 1 ) Small branches to the third, fourth, and fifth limbs of the 

 ascending colon. 



(2) The appendicular artery (a. appendicularis) to the 

 vermiform process. A branch of this vessel, given off 

 near the point of origin, passes to the ileum, anasto- 

 mosing with a branch of the superior mesenteric trunk. 



(3) An anterior ileocaecal artery to the terminal fourth 

 (third limb) of the caecum proper and related portion 

 of the ileum. 



(4) An anterior right colic artery to the flexure uniting 

 the first and second limbs of che ascending colon. 



(5) A posterior right colic artery to the second limb of the 

 ascending colon. This vessel anastomoses with (4) and 

 with the special branch to the third limb (1). 



The distal branches include: 



(6) A posterior ileocaecal artery to the middle portion 

 of the third limb of the caecum and the adjacent portion 

 of the ileum; anastomosing with (3). 



(7) A caecal artery to the posterior portion of the third 

 limb of the caecum. 



(8) Terminal branches to the parts about the sacculus 

 rotundus; anastomosing with (41. 



(d) The intestinal arteries (aa. intestinales), about twenty in 

 number, are given off from the superior mesenteric artery, 

 and are distributed to the free portion of the mesenterial 

 small intestine. The successive vessels are connected by 

 anastomoses. The end of the superior mesenteric artery has 

 the relation of one of the intestinal arteries. It anastomoses 

 forward with a single branch given off from the side of the 

 vessel opposite to the intestinal arteries, and the latter in 

 turn anastomoses forwards with a branch of the appendicular 

 artery. 



b. Locate in the descending mesocolon the inferior mesenteric 

 artery (a. mesenterica inferior), a small median vessel arising from 

 the abdominal aorta. It has two main branches — the left colic 

 artery a. colica sinistra) to the anterior portion of the descending 



