DEVELOPMENT LYMPHATIC SYSTEM IN AMNIOTES 



291 



Figure 12 



1, Precardinal vein 



2, External jugular-cephalic vein 



3, Jugular lymphsac 



4, Duct of Cuvier 



5, Primitive ulnar vein 



6, Postcardinal vein 



7, Mesenchymal blood-islands 



8, Intercellular mesenchymal spaces, 



the anlages of the primitive ulnar 

 lymphatic 



9, Brachial plexus 



THE AMERICAN JOURNAL OF ANATOMY VOL. 16. NO. 3 



