FATE OF PRIMARY LYMPH-SACS IN ABDOMINAL REGION OF PIG, ETC. 35 



follow the right gastric artery to empty also into the large hepatic glands, and from 

 these into the cceliac glands. When the gall-bladder was injected, some vessels 

 were seen to follow the course of the common duct to the duodenum, then to 

 accompany the portal vein to one of several large nodes situated about that vessel 

 in the angle of the pancreas (fig. 5, Lymgl. d. choled.). Smaller glands were also 

 seen along this vein peripheral to the larger ones. The efferents from these glands 

 go to one or two pre-aortic nodes lying between the coeliac axis and the superior 

 mesenteric nodes (fig. 5). Here, too, as in the earlier stages, there is a double 

 drainage of the liver. 



In these later stages the lymphatics of the spleen failed to inject. Those of the 

 ligament, however, drain into glands at the hilum, from which the efferent flow is 

 through glands which are disposed about the splenic artery. 



The small intestine, large intestine, and descending colon drain into the large 

 mesenteric glands, of which there are several groups. The largest and most im- 

 portant of these are the juxta-intestinal glands (fig. 5, lymgl. juxta-intes.) which 

 are the first to receive the lymph coming from the intestine. They are very large 

 prominent, elongated glands, lying close together, their long axes parallel to that 

 of the intestine. They form a distinct nodular rim or collar to the outer part of the 

 mesentery. Efferents from the juxta-intestinal nodes pass through intermediate 

 glands in the mesentery about the origin of the superior mesenteric artery (Heuer, 

 1909). These retromesenteric glands then receive afferents from the head of the 

 pancreas, duodenum, and intestine. This system of secondary lymph-glands of the 

 intestine, with the peripheral nodes very large and prominent, and the proximal 

 ones smaller and very limited in number, is quite a contrast to the system of the 

 stomach and neighboring organs, in which the glands increase in size and impor- 

 tance the nearer they approach to their termination about the coeliac axis. 



The lymphatics of the pancreas could not be injected directly, but there are 

 indications that this organ has at least four collecting trunks: (1) The drainage 

 from its tail is to the splenic group of glands; (2) the posterior part of the body 

 sends some efferents to the periesophageal nodes; (3) the duodenal portion drains 

 along with the lymph from the pyloric portion of the stomach to the large hepatic 

 nodes; (4) the head of the pancreas sends efferents to the superior mesenteric 

 glands. Bartels (1906) was able to inject the lymphatics of the pancreas in new- 

 born animals, especially the dog, and in a later paper (1907) he described their 

 drainage into the regional glands, which, in general, corresponds to the drainage 

 indicated above. 



It is evident from the earlier stages that the adrenals have a capsular drainage 

 to the cceliac group of glands, while the lymph from the organ itself drains into a 

 gland formed from the cephalic end of the iliac sac, i. e., a juxta-aortic gland which 

 is seen lying anterior to the renal glands (fig. 5, Lymgl. g. suprar.). 



Although not definitely determined, it would seem from the double type of 

 earlier injections that the lymphatics from the kidney would drain into the pre- 

 aortic and perhaps post-aortic, but mainly into the juxta-aortic glands. Several 

 large nodes can be easily seen at the hilum lying behind the renal vessels, suggesting 



