FATE OF PRIMARY LYMPH-SACS IN ABDOMINAL REGION OF PIG, ETC. 25 



mediately breaking up to supply the region of the fundus, the other coursing along 

 the length of the spleen in its ligament to a point near the pyloric extremity. Here 

 it again divides, the smaller branch to continue to the pole of the spleen, the larger 

 turning obliquely toward the greater curvature of the stomach, where it forms a 

 T-shaped termination (fig. 3, V. 1. c. v. maj.) One limb passes toward the cardiac 

 pouch, breaking into many small vessels on the curvature and finally anastomosing 

 with the vessels supplying the fundus; the other limb passes toward the pylorus 

 and likewise drains the greater curvature and anastomoses with the lymphatics of 

 the pylorus. These anastomoses are well shown in figure 3. In none of the 

 specimens could an injection be secured which involved the parenchyma of the 

 spleen itself. 



The right branch arises from the right half of the cceliac trunk and courses 

 ventro-laterally along the gastro-pancreatic line with the hepatic artery, breaking 

 into two branches the hepatic vessels and the right gastric trunk (fig. 3, T. gast. 

 dex.). From the right gastric trunk the pyloric vessels (fig. 3, V. 1. pyl.) pass along the 

 pancreas to the pyloro-duodenal junction, where they turn abruptly forward over 

 the pylorus to anastomose with the lymphatics of the greater curvature . This trunk 

 also sends lymphatics to the body of the pancreas (fig. 3, V. 1. corp. pan.). 



There are two sets of lymphatics going to the liver. The main mass passes 

 along with the hepatic artery, going behind the pyloric end of the stomach (figs. 

 1, 2, and 3; V. 1. hep.). These vessels unite with the other lymphatics accompany- 

 ing the biliary ducts to form the hepatic trunk (fig. 2, V. 1. hep.) . These lymphatics 

 course along with the blood-vessels within the liver in the perivascular and peri- 

 lobular tissue, but not to the lobule of the organ itself (Mall, 1901). The second 

 hepatic set or trunk arises just posterior to the large anterior or cceliac trunk. This 

 lateral trunk splits off laterally from the right side of the retroperitoneal sac toward 

 the portal vein, which it accompanies for a short distance, then branches at right 

 angles, sending vessels in both directions along that vein. Those passing posteriorly 

 unite with those going to the head of the pancreas. As they approach the liver, 

 these vessels along the portal vein join with those of the hepatic branch from the 

 cceliac trunk to enter at the hilum of the liver, although some accompany the biliary 

 ducts and go to the gall-bladder. 



The other main ventral branch from the anterior end of the retroperitoneal sac 

 is the small posterior or superior mesenteric trunk, the stump of which is shown in 

 figure 3. This trunk arises from the sac at about the origin of the superior mesenteric 

 artery and its branches become the satellites of the branches of that artery in the 

 mesentery (fig. 2, V. 1. mes.). The trunk appears in figure 2, which is a view of the 

 lymphatics from the side, and shows quite well the relation of the retroperitoneal sac 

 to the iliac sacs, both as to position and connections. It also brings out the enor- 

 mous mass of lymphatic vessels arising from the anterior end of the retroperitoneal 

 sac. The trunk divides shortly, the smaller (duodenal) branch (figs. 2 and 3, V. 1. 

 asc. duo.) supplying the lower portion of that section of the small intestine and 

 anastomosing with the vessels from above. Lymphatics are also given off from 

 this duodenal branch to the head of the pancreas (fig. 3). The other, the mesen- 



