THE ABDOMEN, INTERIOR. 511 



The gastroduodenalis will be seen to divide into two 

 branches : the right gastro-epiploic, which courses along 

 the greater curvature of the stomach to unite with the left 

 gastro-epiploic ; and the superior pancreaticoduodenalis, 

 which, descending in the interval between the duodenum 

 and the head of the pancreas, supplies both and finally an- 

 astomoses with the inferior pancreaticoduodenalis from the 

 superior mesenteric. Both gastro-epiploic arteries supply 

 the stomach and send off long slender branches to the 

 omentum, which follow backward to meet similar branches 

 from the colic arteries. 



These branches are the epiploic. 



The Superior Mesenteric Artery. Figs. 1 02, 105. 



Will be found coming out between the pancreas and third 

 portion of the duodenum, arising from the front of the 

 aorta. It gives off the inferior pancreaticoduodenalis, 

 which turns to the left between the pancreas and the duo- 

 denum, supplying both, and terminating by anastomosing 

 with the superior artery of the same name. 



DISSECTION. 



Let the stomach and liver drop back into the abdomen. Raise the great 

 omentum and transverse colon upward on to the chest and fasten them there. 

 Dissect off the presenting layer of the peritoneum from the superior mesenteric 

 artery and its branches. It will not be necessary to clean all the intestinal 

 branches to their distribution ; clean their origin, and trace two or three, with 

 their anastomoses, to the smaH intestine. It will be necessary to follow all 

 the other branches coming off the right side of the mesenteric. They are the 

 ileocolic, the right, and middle colic. 



The superior mesenteric artery arises from the front of 

 the aorta (as previously discovered), above the transverse 

 duodenum and below the pancreas. It takes a curved 

 direction downward and to the right iliac fossa. 



(a) Its first branch is the inferior pancreaticoduodenalis, 



