part of aorta abdominal aorta Abdominal part of aorta: the distal part of the descending aorta, which is the continuation of the thoracic part and gives rise to the inferior phrenic, lumbar, median sacral, superior and inferior mesenteric, middle suprarenal, renal, and testicular or ovarian arteries, and celiac trunk. BTO:0002976 BrendaTissueOBO abdominal part of aorta aorta abdominalis pars abdominalis aortae