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Foramen of Winslow

The foramen of Winslow (also called the epiploic foramen) is the passage of communication between the greater (general peritoneal space) and lesser sac (omerntal bursa).

Gross anatomy

Boundaries

It has the following borders:

  • anterior: the free border of the lesser omentum, known as the hepatoduodenal ligament; there are two layers and within these layers are the common bile duct, hepatic artery, and hepatic portal vein
  • posterior: the peritoneum covering the inferior vena cava
  • superior: the peritoneum covering the caudate lobe of the liver
  • inferior: the peritoneum covering the commencement of the duodenum and the hepatic artery, the latter passing forward below the foramen before ascending between the two layers of the lesser omentum
  • left lateral: gastrosplenic ligament and lienorenal ligament

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Abdominal and pelvic anatomy

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