Which foramen connects the lesser sac with the greater sac in the peritoneal cavity?

Which foramen connects the lesser sac with the greater sac in the peritoneal cavity?

• A. Foramen of Winslow
• B. Foramen of Monro
• C. Foramen of Magendie
• D. Foramen of Luschka

Answer: (A)

The passage that allows communication between the lesser sac and the greater sac is the epiploic (omental) foramen, known as the foramen of Winslow. This opening links the two peritoneal spaces—the lesser sac tucked behind the stomach and liver, and the larger, main peritoneal cavity. Its boundaries help you remember its location: in front lies the hepatoduodenal ligament containing the portal triad, behind is the inferior vena cava and right crus of the diaphragm, above is the caudate lobe of the liver, and below is the first part of the duodenum. The other openings listed are not between peritoneal spaces: one is a brain ventricle connection (lateral ventricle to third ventricle), and the others are outlets from the fourth ventricle for CSF. So the correct choice is the foramen of Winslow.

The passage that allows communication between the lesser sac and the greater sac is the epiploic (omental) foramen, known as the foramen of Winslow. This opening links the two peritoneal spaces—the lesser sac tucked behind the stomach and liver, and the larger, main peritoneal cavity. Its boundaries help you remember its location: in front lies the hepatoduodenal ligament containing the portal triad, behind is the inferior vena cava and right crus of the diaphragm, above is the caudate lobe of the liver, and below is the first part of the duodenum. The other openings listed are not between peritoneal spaces: one is a brain ventricle connection (lateral ventricle to third ventricle), and the others are outlets from the fourth ventricle for CSF. So the correct choice is the foramen of Winslow.