descending aorta

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de·scend·ing a·or·ta

[TA]
the part of the aorta continuing distal (inferior) to the aortic arch, further divided into the thoracic aorta and the abdominal aorta.

descending aorta

(dĭ-sĕn′dĭng)
n.
The part of the aorta that extends from the aortic arch into the thorax and abdomen.