ductus duc·tus (dŭk'təs)
n. pl. ductus
The ductus cochlearis and the two scalae are filled with fluid.
This it accomplishes by the structures in the ductus cochlearis.
The ductus arteriosus closes up about the same time as the foramen ovale.
The main trunk is however never completely aborted, as in the embryos of other types, but remains as the ductus venosus Arantii.
From the point of junction of anterior and posterior cardinal a large transverse vessel leads to the heart (ductus Cuvieri).
In Elasmobranchii the primitive median diverticulum (fig. 421) gives rise to the ductus choledochus.
From the ductus venosus there is given off a vein which quickly divides into two branches.
The sinus venosus receives the blood from the great veins (ductus Cuvieri and hepatic veins).
The ductus venosus becomes moreover merely a small branch of the vena cava.
In Selachians the otocyst remains in the adult open to the exterior by the ductus endolymphaticus.