76 



Basic Structure of Vertebrates 



-Int. Jugular 

 -Ext. Jugular 



left 



Subclavian 



Coronary 

 5inu5 



Gonadial 



Common Iliac 

 Ext. Iliac 

 Int. Iliac 



Fig. 75— (Continued) 

 6-7 mm. pig embryos. (E) Cross section (at level of arrow in D) showing dorso- 

 ventral relations of vessels. (F) Veins in 12-13 mm. embryos. (G) Veins in 16-19 

 mm. embryos. (//) Veins in 22-24 mm. embryos. (/) Veins in 30-35 mm. embryos. 

 (J) Cross section of 17 mm. embryo at level of arrow in G. (K) Plan of veins in 

 adult pig. (After Butler. Courtesy, Patten: "Embryology of the Pig," Philadelphia, 

 The Blakiston Company.) 



