NCIt definition : The portion of the descending aorta that lies within the abdomen, beginning below
the diaphragm and ending at its division into the right and left common iliac arteries.;
Alternative definition : CDISC: The portion of the descending aorta that lies within the abdomen, beginning
below the diaphragm and ending at its division into the right and left common iliac
arteries. (NCI); ACC/AHA: The lower part of the aorta in the abdomen prior to its bifurcation to the
iliac arteries, whose pulse can be palpated at the level of the umbilicus.;