part of part of in taxon develops from develops from Arthropoda vessel mesoderm circulatory system mesoderm-derived structure circulatory system dorsal vessel https://genent.cals.ncsu.edu/wp-content/themes/salient/img/intanat/hemo2a.gif A tube that runs longitudinally through the thorax and abdomen, along the inside of the dorsal body wall and that forms the major structural component of the open circulatory system of arthropods. dorsal vessel FBbt:00058291 UBERON:0015231