Why are the kidneys said to be retroperitoneal?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Retroperitoneal**: The term "retroperitoneal" refers to the anatomical position of certain organs that are located behind the peritoneum, which is the lining of the abdominal cavity.

2. **Location of Kidneys**: The kidneys are situated in the abdominal cavity but are positioned behind the peritoneal lining. This means they are not enclosed by the peritoneum like some other abdominal organs.

3. **Surrounding Fat Tissue**: The kidneys are surrounded by a layer of fat known as perirenal fat. This fat serves as a protective cushion for the kidneys and helps to anchor them in place.

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