66 ALLEN 



and the remaining branches follow terminal branches (c), {d) 

 and {e). Ordinarily i or 2 branches from the last mentioned 

 arteries follow along in the gastro-hepatic omentum to supply 

 the ventral portion of the stomach. All of the branches of the 

 left hepatic artery follow their corresponding venous trunks to 

 their terminal endings in the substance of the liver. The left 

 hepatic artery furnishes the principal arterial supply for the 

 liver, but in some specimens an additional ^posterior or minor 

 left hefatic artery (PI. I, fig. 11 ; L.Hep.A.^)) arises from the 

 coeliac a little farther caudad than the main left hepatic arter}- 

 and anastomoses with the posterior branches of the left hepatic 

 vessel. Beside the left hepatic vessels there is also the right 

 hepatic artery for the small right lobe of the liver, which will 

 be described further on under the mesenteric artery. 



Continuing caudad, parallel, but to the right of the left 

 portal vein, the coeliac artery divides directly in front of the 

 pylorus into a right and left pyloric casca artery. One of 

 these forks (usually the right) is always considerably longer 

 than the other. The right -pyloric cceca artery^ PL I, figs, i and 

 6; R.Cge.A.) passes at least two-thirds around the pylorus, in- 

 side of the pyloric caeca vein a little above the cceca, and in its 

 course gives off at least 3 branches to the ca^ca. Within the 

 caica the larger vessels run in the muscular coats and break up 

 into a capillary network in the connective tissue layer of the 

 crypts as in the intestine. One branch of the right pyloric 

 caica artery is sent off to the pylorus and 2 rather large pos- 

 terior gastric arteries are given off to the posterior or cardiac 

 portion of the stomach. From the right posterior gastric ar- 

 tery (fig. I ; R. P. Gas. A.) one or more branches run along in 

 the peritoneal fold over the cceca to anastomose with the intes- 

 tinal branch of the mesenteric artery. The left pyloric cceca 

 arter}'-, which is usually much smaller than the right, pursues 

 a similar course on the left side of the pylorus, giving off 2 or 

 3 branches to the cceca and one to the pylorus. When this is 

 the smaller of the 2 ca3ca arteries, no branches are given off 

 from it to the posterior end of the stomach, however, only in 

 about one case in 10 is the left pyloric ca^ca artery larger than 

 the right. 



