dorsal aorta

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dorsal aorta

a large embryonic artery formed by the fusion of the caudal parts of the paired primordial aortae. It becomes the descending (thoracic and abdominal) aortae and median sacral artery.

aorta

; dorsal aorta major artery extending from the left ventricle, initially as the ascending aorta, the aortic arch, and thence thoracic and abdominal parts of the descending aorta, which terminates at the level of the fourth lumbar vertebra to divide to form right and left common iliac arteries