ductus venosus ductus ve·no·sus (vē-nō'səs)
A fetal vein that passing through the liver to the inferior vena cava.
From the ductus venosus there is given off a vein which quickly divides into two branches.
The main trunk is however never completely aborted, as in the embryos of other types, but remains as the ductus venosus Arantii.
The ductus venosus becomes moreover merely a small branch of the vena cava.
The third continues through the ductus venosus to the common hepatic vein and sinus venosus (Fig. 256).
The ductus venosus thus becomes the chief vessel returning arterialized placental blood to the heart.
(a) Cephalic portion, remaining in the original sagittal plane, follows the fissure for the ductus venosus.