Which organ is NOT considered retroperitoneal?

The stomach is correctly identified as not being retroperitoneal because it is located in the intraperitoneal space. The intraperitoneal organs are surrounded by the peritoneum, a serous membrane that forms a protective covering and helps in the mobility and function of abdominal organs. The stomach, as a key component of the digestive system, is suspended in the abdominal cavity and has a greater mobility due to its connection via the greater and lesser omentum.

In contrast, the kidneys, adrenal glands, and pancreas are classified as retroperitoneal organs. This means they are situated behind the peritoneum and have only a partial covering by it. Retroperitoneal organs usually include structures such as the kidneys and adrenal glands, which are anchored to the posterior abdominal wall, as well as the pancreas, which lies against the back wall of the abdominal cavity.

Understanding this distinction helps clarify the organization of abdominal organs and their relationships within the peritoneal space, aiding students in visualizing and comprehending human anatomy better.