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Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Anatomical features:

  • length = 30 cm
  • considered in terms of four parts:
    • first part
      • intraperitoneal
      • 5cm long
      • anatomical relationships:
        • inferior vena cava and bile duct pass posteriorly
    • second part
    • retroperitoneal
      • anatomical relationships:
        • course around the the head of the pancreas
        • ampulla of Vater in the second part
    • third part
    • retroperitoneal
      • anatomical relationships:
        • crosses anterior to the inferior cava, aorta and the origin of the inferior mesenteric artery
        • the superior mesenteric artery is anterior to the third part
    • fourth part
    • anatomical relationships:
      • passes upwards along the left side of the aorta and terminates at the ligament of Trietz (start of the jejunum)

  • muscle layers - outer longitudinal and inner muscular layer
  • Brunner's glands - most prominent in the proximal duodenum (alkaline secretions)

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