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mesenteric plexus

n :  either of two plexuses of the sympathetic nervous system lying mostly in the mesentery in close proximity to and distributed to the same structures as the corresponding mesenteric arteries:  a  :  one associated with the inferior mesenteric artery - called also inferior mesenteric plexus   b  :  a subdivision of the celiac plexus that is associated with the superior mesenteric artery - called also superior mesenteric plexus  .

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