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(A) Surgical anatomy of pelvic anatomic nerves related to the nerve-preserving surgery of sigmoid colon cancer. (B) The inferior mesenteric plexus (yellow arrow) encircles the root of inferior mesenteric artery (IMA). (C) The superior hypogastric plexus overlying the interiliac trigone area. (D) The right hypogastric nerve travels across the presacral areolar tissue and then adheres to the proper rectal fascia.
