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Presacral space (embalmed cadaver). PM—psoas muscle; LCIV—left common iliac vein; LCIA—left common iliac artery; UR—ureter; MSA—middle sacral artery; PR—promontory; RCIV—right common iliac vein; SRA—superior rectal artery; RCIA—right common iliac artery; EIA—external iliac vein; IIA—internal iliac vein; MR—mesorectum; R—rectum; U—uterus; TMRA—trans-mesorectal approach; IFA—inter-fascial approach.
