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 (4). 
(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. 
8. 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 
