The ductus cochlearis and the two scalae are filled with fluid.
This it accomplishes by the structures in the ductus cochlearis.
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 ...