Which organ is an example of a retroperitoneal organ?

The kidneys are classified as retroperitoneal organs because they are located behind the peritoneum, which is the serous membrane that lines the abdominal cavity. This positioning means that the kidneys are not surrounded by the peritoneal cavity but instead lie posterior to it, directly in the abdominal wall. This anatomical feature is important because it impacts their relationship with other abdominal organs and structures, as well as their vascular supply and innervation.

In contrast, the stomach and the liver are intraperitoneal organs, meaning they are fully covered by peritoneum and have a different interaction within the abdominal cavity. The bladder, while located in the pelvic region, is also classified as a subperitoneal organ but is not retroperitoneal like the kidneys. Understanding these distinctions is crucial for comprehending human anatomy and the organization of the abdominal cavity.