The subintestinal vein continue anteriorly as the hepatic portal vein running ventrally along up in the midgut diverticulum into which it breaks up in a capillary network. Blood is collected by a hepatic vein running along its dorsal border and bending downwards to join the sinus venosus. Hepatic portal system occuring for the first time in Branchiostoma is a precursor of that of higher chordates.
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