The most impoant structure involved in the development of inferior vena cava: (A) Supra cardinal vein and sub cardinal vein, (B) Persistence of Supra cardinal veins, (C) Persistence of sub cardinal veins, (D) Persistence of both supra and sub cardinal vein
Answer is A. 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