vena cava

https://doi.org/10.1351/goldbook.11362
Large vein returning deoxygenated blood to the right heart.
Note: The vena cava has two branches in humans, the inferior vena cava (carrying blood from the lower body) and the superior vena cava (carrying blood from the head, arms, and upper body).
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 819 [Terms] [Paper]