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



23 



first in the form of a film, but in older embryos as distinct vessels) over the adrenal 

 capsule and the anterior pole of the kidney (fig. 3, V. 1. cap. gl. suprar.). As the 

 trunk twines ventrally around the body of the pancreas, lymphatics are given off to 

 the middle portion of that organ. These pancreatic vessels are not shown in figure 

 3, but would come off in front of the lower portion of the trunk of the lesser curvature 

 (T. c. V. min.). Laterally, vessels pass from the mesial trunk to the diaphragm 

 (fig. 1, V. 1. diaph.), uniting with those from the anterior end of the iliac sacs. 



From the mesial trunk, as previously stated, there are several efferent vessels 

 emptying into the thoracic duct (fig. 2, Anas, ant.) On either side of these vessels 

 several long lymphatic channels run cephalad with the pulmonary ligament to 

 supply the lower portions of the lung (fig. 2, V. 1. pulm.). The largest trunk of the 



D.thor 



V.I. hep. 



Vena umb. 



D.omph.mes, 



V I me 3 



Ramus Retroren.. 

 S.il. 



5. retroperil. 



5. il.pors caud. 



T.post. 



FIG. 2. Right lateral view of pig em- 

 bryo (No. 24) 6 cm. long, showing 

 connections and relative positions 

 of the primary lymph-sacs that 

 is, of the retroperitoneal sao and 

 the iliac sacs. Lymphatics in- 

 jected with india-ink through the 

 thoracic duct. Drawing made 

 from specimen by J. F. Didusch. 



_Vena 

 omph mea, 

 A umb. 



