Pararectal Fascia

fascia pararectalis

The lateral connective tissue envelope of the mesorectum, forming the "holy plane" of TME dissection between the mesorectal fascia and the parietal endopelvic fascia.

Anatomical Data

Boundaries & Contents

Location	Pelvis, wrapping the rectum and its surrounding fat (mesorectum)
Boundaries	Encloses the mesorectum from the sacral promontory to the pelvic floor Behind: presacral fascia In front: Denonvilliers fascia or rectovaginal septum Laterally: pelvic sidewall with its autonomic nerves
Contents	Mesorectal fat Superior rectal vessels and their branches Mesorectal lymph nodes

Biomechanics

Function & Actions

Forms the envelope that is removed intact in total mesorectal excision for rectal cancer, keeping tumour cells inside and the pelvic nerves outside.

Clinical Relevance

Clinical Notes

The pararectal fascia plane is the critical anatomy of TME surgery. Sharp dissection in this embryological fusion plane between visceral (mesorectal) and parietal (endopelvic) fascia achieves an intact mesorectal specimen with negative circumferential margins and preserves the hypogastric and splanchnic nerves.

Pathology

Common Injuries & Conditions

TME Plane Violation

Entering the wrong plane outside the pararectal fascia during TME breaches the mesorectal envelope, risks a positive circumferential margin, and may injure the ureters or pelvic autonomic nerves.

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