n :  either of two ganglionic masses of the sympathetic nervous system associated with the corresponding mesenteric plexus:  a  :  a variable amount of massed ganglionic tissue of the inferior mesenteric plexus near the origin of the inferior mesenteric artery - called also inferior mesenteric ganglion   b  :  a usu. discrete ganglionic mass of the superior mesenteric plexus near the origin of the superior mesenteric artery - called also superior mesenteric ganglion  .
 
 
 
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