Vena Cava

The vena cava cranialis (upper vena cava) is distinguished from the vena cava caudalis (lower vena cava). They're collecting the [venös/en|venous] Blood from the upper or lower half of the body flows into the right atrium.

https://de.wikipedia.org/wiki/Hohlvene _{(Wikipedia CC-by-sa-3.0)}