During development of the
veins, the first indication of a
parietal system consists in the appearance of two short transverse veins, the
ducts of Cuvier, which open, one on either side, into the
sinus venosus. Each of these ducts receives an ascending and descending vein. The ascending veins return the blood from the parietes of the trunk and from the
Wolffian bodies, and are called
cardinal veins.
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