MCQ – 86642

The below diagram shows the epiploic foramen. Along the superior boundary the structure marked in the figure corresponds to:

A.	Lesser omentum
B.	Caudate lobe
C.	Duodenum
D.	IVC

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Correct Answer � B Explanation

Ans.B. Caudate lobe.  Ref. Grays anatomy. Pg 1107

• The omental foramen (epiploic foramen, foramen of Winslow, or foramen epiploicum) is the passage between the greater sac and the lesser sac of the abdomen.
• The omental foramen has the following borders:

1. Superior: The peritoneum that covering the liver (caudate lobe in particular)
2. Inferior: The peritoneum that covering the duodenum and the hepatic artery.
3. Anterior: The free border of the lesser omentum. This is known as the hepatoduodenal ligament.
4. Posterior: The peritoneum that covers the inferior vena cava.
5. Left lateral: The splenorenal and gastrosplenic ligaments. 

The omental foramen can be remembered as lying between the two most significant veins of the abdomen – the portal vein and the inferior vena cava.