Rectum

• Continues from sigmoid at S3, along the anterior surface of Sacrum, passes through the pelvic diaphragm and becomes continuous with anal canal.
• Anorectal junction
  • 2-3 cm below the tip of Coccyx
• 12 cm long
  • Upper part 4cm in diameter
  • Lower part dilated : Rectal ampulla
• Peritoneum from front reflects to form
  • rectovescical pouch
  • recto uterine pouch
• Relationship
  • Posterior
    • Sacrum
    • Sacral plexus and vessels
  • Anterior
    • Male
      • Bladder
      • Seminal vescicle
      • Rectovesical pouch
      • Small bowel
      • Sigmoid
      • Ureters
      • Prostate
    • Female
      • Uterus
      • Vagina
      • Rectouterine pouch
      • Small bowel
      • sigmoid
  • Lateral
    • Pararectal fossa
    • Piriformes
    • Levator ani
    • Coccyges