Which sac is bordered anteriorly by the stomach and posteriorly by the pancreas?

The lesser sac, also known as the omental bursa, is positioned between the stomach anteriorly and the pancreas posteriorly. This anatomical relationship is significant in understanding the peritoneal spaces within the abdominal cavity.

The lesser sac is essentially a recess within the peritoneal cavity that allows for the mobility of the stomach and lubrication of the surrounding organs. Its boundaries, being bordered by the stomach and the pancreas, play a crucial role in surgical approaches and understanding the spread of diseases within the abdominal cavity. The lesser sac is also relevant in various clinical conditions, such as pancreatitis, where fluid collections can occur, and in the assessment of complex abdominal pathologies.

In contrast, the greater sac is the larger peritoneal cavity that encompasses most of the abdominal viscera and is not specifically designated by the anterior and posterior relationships inherent to the lesser sac. The peritoneum is the overall serous membrane lining the abdominal cavity and covering the abdominal organs, rather than a distinct cavity like the lesser sac. Similarly, the omentum refers to the double layer of peritoneum extending from the stomach to adjacent organs, but it does not define a specific sac-like space bordered by the stomach and pancreas. Understanding these distinctions highlights the unique structure and