24 



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



mesial mass is the gastric trunk of the lesser curvature, which is described by Cash 

 (1921). This is shown in part in figure 1, but still better in figure 3, which is a 

 view of the stomach from below, designed to show the main mass of lymphatics of 

 the lesser and greater curvatures and special lymphatics of the pylorus. It shows 

 also the relation of the lymphatics to the pancreas. It is to be noted that the 

 spleen, with the lymphatic vessels in its capsule and mesentery, has been removed 

 and that the gastro-splenic trunk has been cut just as it is dividing into its two 

 terminal branches. The intestines have been removed, leaving only the stump of 

 the superior mesenteric trunk. This gastric trunk terminates at the lesser curvature 

 by dividing into two branches: (1) an ascending or left branch, which supplies the 

 cardiac region of the stomach, forms a network of periesophageal lymphatics, and 

 sends out vessels to the medial portion of the diaphragm; (2) a descending or right 

 branch, which likewise supplies the cardiac region, diaphragm and lesser curvature 

 (fig. 2, V. 1. diaph.; T. c. v. min.), and anastomoses with other vessels supplying the 

 diaphragm and lesser curvature. 



The left trunk, of which the main branch is the gastro-splenic trunk (fig. 3), 

 passes ventrally to the fundus of the stomach. Near its origin it sends lymphatics 

 to the tail of the pancreas. It continues on to the fundus as the gastro-splenic 

 trunk, then divides beneath the posterior third of the spleen, one branch im- 



V.l.c.v.maj. 



Vl.pyl 



V.I. hep. 



V.I. corp. 

 pan. 



T.qast.dexf 

 V. I. asc. duo 



V.l.cap.ql.suprar. 



V.l.capulpan 



Fio. 3. Pig embryo (No. 74), 6 cm. long. Ventral view of anterior end of retroperitoneal sac, showing the main gastric 

 trunks and the lymphatics of the pancreas. The spleen has been removed. Lymphatics injected with 

 india-ink through the thoracic duct. Drawing made from specimen by J. F. Didusch. 



