Proceeding caudally, the inferior mesenteric artery next arises from the aorta anteriorly and often to the left of midline, approximately 3 to 5 cm above the aortic bifurcation.

• 往尾部继续前进，主动脉的下一分支是从前面伸出的肠系膜下动脉，它的分支点通常是在中线的左边，大约在主动脉杈上面3-5cm处。