**Question:** The boundaries of the interconnection between greater sac and lesser sac of peritoneum known as Foramen of Winslow are all, EXCEPT:

A. Omental bursa
B. Antrum pyloricum
C. Second part of duodenum
D. Cecum

**Core Concept:**
Foramen of Winslow is a small opening located between the greater sac (superiorly) and lesser sac (inferiorly) of the peritoneum. It allows communication between the peritoneal cavity and the gastrointestinal tract, connecting the greater sac to the lesser sac. The names mentioned represent key anatomical structures within the abdomen.

**Why the Correct Answer is Right:**
The correct answer, D) Cecum, is excluded because the Foramen of Winslow is not associated with the cecum. Instead, the cecum is part of the large bowel and is located in the right iliac fossa, whereas Foramen of Winslow is situated within the lesser sac of the peritoneum.

**Why Each Wrong Option is Incorrect:**
A) Omental bursa is a pouch of peritoneum that houses the left colon, not a part of the Foramen of Winslow. It is located between the greater omentum and the left colon, allowing the colon to slide freely.

B) Antrum pyloricum is part of the stomach and is not related to the Foramen of Winslow. Antrum pyloricum refers to the lower part of the stomach, which is not involved in the anatomy of the peritoneum.

C) Second part of duodenum connects with the lesser sac of the peritoneum, but it is not part of the Foramen of Winslow. The Foramen of Winslow is a passage between the lesser sac and the greater sac, while the second part of the duodenum is situated in the lesser sac.

**Clinical Pearl:**
Foramen of Winslow is a crucial anatomical structure to understand for physicians, surgeons, and gastroenterologists, as it is involved in various medical conditions, such as appendicitis, which can lead to the perforation of the appendix and the spread of infection into the peritoneal cavity through the Foramen of Winslow. This knowledge is essential for accurate diagnosis and management of these conditions.