part_of part of part of Homo sapiens anatomical structure thoracic aorta descending thoracic aorta UBERON:0002345 MA:0002572 FMA:87217 SCTID:181301002 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