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Arch Surg. 2000;135:1105.

	Since this article does not have an abstract, we have provided the first 36 words of the full text and any section headings.

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

1. Blackbourne LH, Fleischer KJ. Advanced Surgical Recall. Baltimore, Md: Williams & Wilkins; 1997:798.