The most impoant structure involved in the development of inferior vena cava
Inferior vena cava develop from sub cardinal vein especially the renal segment and the post renal segment. Right posterior cardinal vein contributes the inferior most component of IVC. Ref: Gray's 39e/p-210-220
Supra cardinal vein and sub cardinal vein
Persistence of Supra cardinal veins
Persistence of sub cardinal veins
Persistence of both supra and sub cardinal vein
General anatomy