pars descendens aortae
[TA] the continuation of the aorta from the arch of the aorta, in the thorax, to the point of its division into the common iliac arteries, in the abdomen; divided anatomically into a thoracic part (pars thoracica aortae) and an abdominal part (pars abdominalis aortae). Called also aorta descendens [TA alternative] and descending aorta.
Medical dictionary.
2011.