854 



DEVELOPMENT 



[CH. LIX. 



The upper part of the primitive jugular vein on each side becomes 

 the internal jugular. The lower part on the right side becomes the 

 right innominate vein, and the upper portion of the superior vena 

 cava. On the left side the lower part helps to form the left superior 

 intercostal vein. 



The left innominate vein is a transverse anastomosis between the 



FIG. 652. The dark are the primitive, the light the secondary veins, with the exception of the external 

 and internal jugular veins. The dark portions entering the auricles are the remains of the primi- 

 tive ducts of Cuvier. The dark portion above each duct of Cuvier, as far as the external and 

 internal jugular veins, is the primitive jugular vein, and the dark portion below the duct of Cuvier 

 is the cardinal vein. 1, External jugular vein; 2, internal jugular vein ; 3, subclavian vein ; 4, right 

 innominate vein ; 5, superior vena cava ; 6, right superior intercostal vein ; 7, vena azygos major ; 

 8, right hepatic vein ; 9, upper part of inferior vena cava ; 10, renal vein ; 11, right common iliac 

 vein ; 12, right external iliac vein ; 13, right internal iliac vein ; 14, left innominate vein ; 15, left 

 superior intercostal vein ; 1(5, oblique vein of Marshall ; 17, vena azygos minor superior ; 18, vena 

 azygos minor inferior ; 19, atrophied part of left cardinal vein ; 20, left common iliac vein ; 

 21, auricle ; 22, duct of Cuvier. 



primitive jugular veins. The subclavian veins arid the external 

 jugular veins are new formations, the former being developed in 

 association with the growth of the upper limbs. 



The cardinal veins receive the intercostal and lumbar veins from 

 the walls of the body, and the veins from the Wolffian bodies and 

 kidneys. Below the point of union with the external iliac vein from 

 the hind limb the cardinal vein becomes the internal iliac vein. 

 Above the external iliac vein the right cardinal vein forms the right 



