22 



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



The large coeliac trunk (figs. 1 and 2, T. coel.) immediately divides into a right 

 and a left branch, the latter soon breaking into the mesial trunk and the left trunk. 

 The left trunk, which includes the gastro-splenic trunk, is not shown in figure 1, 

 being on the other side of the fold of mesentery, but it can be well seen in figure 3. 

 The mass of lymphatics at the anterior end of the retroperitoneal sac courses 

 cephalad for a short distance and then turns ventrally, breaking up into several 

 main lymphatic branches. This ventral curve is shown in figure 2. A little way 

 beyond the origin of the mesial trunk, lymphatic vessels pass laterally to spread (at 



V I c vmin. 

 V I 



Diaph 



61. suprar. 



V.I. hep. 



T. coel . 

 Liq.diaph. 



V.l.ren. 



Vlqon 



Meson 



T. il.com 



Flo. 1. Ventral view of pip em- 

 bryo (No. 73) 7.8 cm. long, 

 showing ventral or retroperi- 

 toneal sac broken up into a 

 coarse plexus, a stage about 

 midway between the earlier 

 complete sac and later group 

 of lymph-glands. Lymphat- 

 ics injected with india-ink ' 

 through the thoracic duct. ' 

 Drawing made from speci 

 men by J. F. Didusch. 



Liq Geniroinq. 

 Or. uret. 

 in urog. 



T. hypo. 



