part_of part of is part of part of contributes to morphology of Homo sapiens descending aorta thoracic aorta descending thoracic aorta uberon UBERON:0002345 MA:0002572 FMA:87217 The part of the aorta that extends from the arch of the aorta to the diaphragm, and from which arises numerous branches that supply oxygenated blood to the chest cage and the organs within the chest. EMAPA:18605 EFO:0002527 mesoderm-derived structure subdivision of tube