Medical Definition of splanchnic nerve
: any of three important nerves situated on each side of the body and formed by the union of branches from the six or seven lower thoracic and first lumbar ganglia of the sympathetic system:a: a superior one ending in the celiac ganglion—called also greater splanchnic nerveb: a middle one ending in a detached ganglionic mass of the celiac ganglion at the origin of the renal artery—called also lesser splanchnic nervec: an inferior one ending in the renal plexus—called also least splanchnic nerve, lowest splanchnic nerve
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