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The iliolumbar artery is the first branch of the posterior trunk of the internal iliac artery. The iliolumbar artery turns upward behind the obturator nerve and the external iliac artery and vein.
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The iliolumbar artery is the first branch of the posterior trunk of the internal iliac artery. The iliolumbar artery turns upward behind the obturator nerve and the external iliac artery and vein.