Ventral view of the blood vessels of the hepatic region and their communications at the venous end of the heart. The umbilical veins still empty bilaterally into the sinus venosus. Based on Born reconstructions and serial tracings of No. 836.

[The above text and accompanying figure are taken from O'Rhailly, R., and Müller, F.. Developmental Stages in Human Embryos, Carnegie Institution of Washington, Publication 637, 1987.]

[adapted from figure 13-5]