. Dissection of the dog as a basis for the study of physiology . efly along the smallcurvature of the stomach. c. The Splenic Artery, the most posterior divi-sion, splits into two main branches distributed chieflyto the spleen. Each sends branches to the stomachalong the great curvature, and some smaller branchesare given off to the pancreas also. 4. The Superior Mesenteric Artery arises from theaorta a short distance posterior to the coeliac axis. Itgives off a number of branches which supply the smallintestine and the greater portion of the large intes-tine. Follow its course in the mesenter
. Dissection of the dog as a basis for the study of physiology . efly along the smallcurvature of the stomach. c. The Splenic Artery, the most posterior divi-sion, splits into two main branches distributed chieflyto the spleen. Each sends branches to the stomachalong the great curvature, and some smaller branchesare given off to the pancreas also. 4. The Superior Mesenteric Artery arises from theaorta a short distance posterior to the coeliac axis. Itgives off a number of branches which supply the smallintestine and the greater portion of the large intes-tine. Follow its course in the mesentery. 5- Posterior to the last two small arteries are givenoff, that on the left side being somewhat anterior tothe other. Each divides into two branches, one ofwhich passes anteriorly, the phrenic artery, to supplythe diaphragm, while the other is distributed to themuscles of the abdominal wall. This latter branch,supplies also the adrenal bodies. 6. The Renal Arteries are two lars^e trunks, one on ungual NT. MAXILLARY •TEMPORAL POST. AURICULARBRANCH TO TO ABDOMINAL WALL EXTERNALvSX^ ILIAC Fig. 4.—Arterial System of the Dog. DISSECTION OF THE VASCULAR SYSTEM. 53 each side, going directly to the kidneys. The arteryon the left side is somewhat posterior to that on theright. Each artery as it enters the hilus of the kidneysplits into two or more branches. 7. Muscular Branches. Posterior to the renal arteriesseveral muscular branches may arise which are dis-tributed to the muscles of the abdominal wall. 8. The Spermatic Arteries. In the male they formtwo small branches of the aorta arising some distanceposterior to the renals and going to the testes. Theypass to the inguinal canal, and reach the testes in thespermatic cords. In the female they are known as theovaria7i a7teries, and pass more directly outward toreach these bodies, being distributed to them and tothe anterior portion of the oviducts. 9. The Inferior Mesenteric Artery comes off from theaorta some distance po
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