280 



THE DEVELOPMENT OF THE VASCULAR SYSTEM 



The Posterior Cardinal Veins and the Origin of the Inferior Vena Cava — 



The posterior cardinal veins course cephalad along the dorsal side of the mesone- 

 phroi and open into the common cardinal veins (Fig. 274, A). Each receives an 



R, Arit. cardinal vein 



ft. Post cardinal vein 

 Rcom.cardinalVein 



Subclavian Vein. 

 R.vifelhne vein 



ft. Umbilical 



ye err 



RJbst. cardinal 

 vein 



faomJtiac Vein 



Caudal vein 



fWfil.cardinal Vein 



R.SubcardmaJ 

 Vein 



Metanephras 



R. Supra cardinal 

 Vein 



R. ischiadic vein. 



R.caudaJ vein 



Erfjuqular Vein 



Subclavian vein 



Int. jugular vein 



Com. Cardinal vein 



Fbst 

 Card. VH 



Cardinal 



vein 



2) Ett.juauiar Vein. 



Subclavian vein 



AzyyoS Vein 



Jnt.juau/ar vein 



L.vena anonynja. 



Coronary sinus 



Inf.vena cava 



Hepaiic Vein 

 Htmi-azyqos if tin 



R. Suprarenal vein 



R.renal vein 



Lrenal Vein 



Spermatic veins 



Ext iliac v.eirt 

 Com. iliac Vein 



imi-azyoes 

 vein '* 



Int Hiac veins 



Afedian Sacred vein 



Ischiadic vein 



Caudal vein ' 



Fig. 274. — Four diagrams showing the development of the superior and inferior venae cavee and the 

 fate of the cardinal veins (modified after Kollmann). X in A, anastomosis between hepatic and sub- 

 cardinal vein; *, anastomosis between subcardinal veins; X in C, anastomosis between anterior car- 

 dinal veins which forms the left vena anonyma; * in C, cranial anastomosis between the posterior car- 

 dinal veins; z, caudal anastomosis between the same veins; if, kidney; S, suprarenal gland; 7", testis. 



