The abdominal aorta originates at the level of the twelfth thoracic vertebra and bifurcates at lumbar vertebra 4. The bifurcation of the aorta with respect to an external landmark is at the level of the umbilicus.1
September 2000. Arch Surg. 2000;135(9):1105. doi:10.1001/archsurg.135.9.1105
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