PHYSIOLOGY, AND PATHOLOGY OF THE CHIMPANZEE. 379 



The artery gives ofi' a trunk which divides into : — 



1. Eight gastric artery (r.g.a), which anastomoses with the left 

 gastric artery on the lesser gastric curvature. 



2. Pyloro-duodenal vessels (2).d.v), which anastomose with the 

 inferior pyloro-duodenal artery. 



3. Right gastro-epiploic artery (r.g.e.a), which anastomoses with 

 branches of the splenic artery in the great omentum. 



The Coronary Artery {G. A) is continued through the oesophagus 

 as the (esophageal artery {o.a). Branches arising from its lateral 

 side are : — 



1. Anterior gastric arteries {a.g.a) to the anterior wall of the 

 stomach in the fundus and body. 



2. Posterior gastric arteries (p.g.a) to the posterior wall of the 

 stomach in the fundus and body. 



3. Left gastric artery {l.g.a), in the lesser omentum, anas- 

 tomoses with the right gastric artery. 



The Inferior Pyloro-duodenal Artery (I.P.D.A) anastomoses 

 with branches of the hepatic and superior mesenteric arteries. 



The Splenic Artery (S.A) runs infero-laterally and divides into 

 two terminal splenic vessels. It gives off branches to the stomach 

 {g.l>) and several vessels which form the left gastro-epiploic 

 artery (l.g.e.a) which anastomoses with the right artery. It is 

 much smaller than the hepatic artery. 



The Superior Mesenteric Artery (text-fig. 40 B) sweeps down- 

 wards into the right iliac fossa. It supplies the duodenum, 

 jejunum, ileum, and large intestine as far as the right third of the 

 transverse colon. It divides into two main branches. The 

 trunk of the artery and left branch (Z.6) supply the small 

 intestine from the duodenum to the junction of the middle and 

 lower thirds of the ileum, the vessels for these parts coming off 

 close together. The highest branch anastomoses with the inferior 

 pancreatico-duodenal branch of the coiliac axis, and the lowest 

 one anastomoses with the highest branch of the other half of the 

 superior mesenteric artery. The trunk of the artery gives off a 

 branch (6) which bifurcates ; the one half anastomoses with the 

 lower branch of the parent stem, and its other half anastomoses 

 in the transverse meso-colon with the middle colic branch of the 

 inferior mesenteric artery. The arterial arcades in the mesentery 

 are not numerous. Many glands and sympathetic nerves are 

 mixed with the vessels. 



The Inferior Mesenteric Artery (text-fig. 40 C) arises from the 

 front of the abdominal aorta about three-quarters of an inch 

 above its bifurcation. It runs downwards for half an inch and 

 divides into two vessels which subdivide into large bundles of 

 vessels for the iliac and pelvic colons. These vessels anastomose 

 with one another. The parent artery gives off a large vessel, 

 which divides into middle and left colic arteries, and the latter 

 divides into ascending and descending branches. The tnid colic 



