a, occipital bone; 6, fifth 

 cervical vertebra ; c, d, c, first, 

 sixth and twelfth rib respect- 

 ively; /, fifth lumbar vertebra. 



I, superior vena cava; 2, 2', 

 right and left subclavian 

 veins; 3, right internal jugu- 

 lar vein; 4, 4', right and left 

 external jugular veins; 5, 5', 

 right and left vertebral veins ; 

 6, left subclavian vein at its 

 junction with the thoracic 

 duct; 7, 7', 8, mammary and 

 intercostal veins ; 9, 9, 9, large 

 azygos vein ; 10, thoracic duct ; 



II, inferior vena cava; 12, 

 junction of azygos vein with 

 left renal vein; 13, 13', lumbar 

 veins connected both with 

 azygos vein and vena cava; 

 14, exteral iliacs. (A portion 

 of the ascending vena cava, 

 together with the hepatic 

 veins emptying into it, are 

 here shown cut away.) 



14 V 



(Facing Page 155.) 



Fig. 75. THE VENA CAVA AND THE PRINCIPAL VENOUS TRUNKS. (From Quain, after 

 Allen Thomson.) 



