During the fifth to the eighth week of embryonic period, the IVC develops as a composite structure via chronological events of formation, regression, anastomosis and substitution of three symmetrical sequential pairs of veins, the posterior cardinal,
subcardinal and supracardinal (Artico et al., 2004).
The paired
subcardinal veins are the next to appear with the right
subcardinal vein forming the suprarenal segment of IVC and the left
subcardinal system regressing.
In chronological order of appearance, they are named postcardinal,
subcardinal, and supracardinal veins.
The one described by Shulman in 1997, which states the persistence of the
subcardinal vein as IVC, seems to be the most accepted one [16].
La vena
subcardinal derecha va a dar origen a la porcion renal y suprarrenal de la vena cava inferior.
It involves a complex process comprising 3-pairs of embryogenic veins: posterior cardinal (iliac and confluent),
subcardinal (renal and hepatic) and supracardinal (prerenal).
The right
subcardinal vein develops into the suprarenal segment by subcardinal-hepatic anastomoses.
While the anterior CVs persist for their most part as permanent vessels, the posterior ones undergo from the 5th week of development (asymmetric stage) regressive changes and new bilateral vessels take place, in particular the
subcardinal veins (Figure 1(b)).
The post-hepatic IVC develops between the sixth and eighth weeks of embryonic life as a composite structure formed from the continuous appearance and regression of three paired embryonic veins, the posterior cardinal, the
subcardinal, and the supracardinal veins.