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Omental foramen
Horizontal disposition of the peritoneum in the upper part of the abdomen.
Entry to omental bursa (black arrow) by omental foramen (white mark)
Latinforamen omentale
Anatomical terminology

In human anatomy, the omental foramen (epiploic foramen, foramen of Winslow after the anatomist Jacob B. Winslow, or uncommonly aditus; Latin: Foramen epiploicum) is the passage of communication, or foramen, between the greater sac (general cavity (of the abdomen)), and the lesser sac.


It has the following borders:

As the portal vein is the most posterior structure in the hepatoduodenal ligament, and the inferior vena cava lies under the posterior wall, the epiploic foramen can be remembered as lying between the two great veins of the abdomen.

Additional images

See also


Public domain This article incorporates text in the public domain from page 1156 of the 20th edition of Gray's Anatomy (1918)