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The main channels by which the blood is returned to the heart. The right hepatocardiac vein is shown particularly well. The coelomic surface over it is modified in a manner that increases the permeability between the coelom and this channel as it empties into the sinus venosus. This greater permeability is most marked at this stage and disappears later. Based on Born reconstructions of No. 836, made by Osborne O. Heard under the supervision of H.M. Evans.

The above text and accompanying figure are taken from O'Rahilly and Müller, 1987. Adapted from figure 13-3.

Keywords: aorta, cardinal vein, coelom, conus cordis, glossopharyngeal nerve (CN IX), hepatocardiac vein, internal carotid artery, left ventricle, otocyst, primary head vein, primordium of facial and vestibulocochlear nerves (CN VII and CN VIII), right atrium, right umbilical vein, right ventricle, sinus venosus, somite 4 (O-4), trigeminal nerve (CN V), ultimopharyngeal pouch, upper limb bud, vagus nerve (CN X), vitelline (omphalomesenteric) vein

Source: The Virtual Human Embryo.