"Columns of Bertini" in the kidney of mommals are formed as the extension of

Options

A. pelvis in ureter
B. cortex in medulla
C. medulla in cortex
D. medulla in pelvis

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of the Kidney**: The kidney is composed of different regions, primarily the cortex and the medulla. The cortex is the outer layer, while the medulla is the inner layer that contains structures called renal pyramids.

2. **Identifying the Columns of Bertini**: The columns of Bertini, also known as renal columns, are extensions of the renal cortex that project into the medulla. They are situated between the renal pyramids.

3. **Describing the Formation of Columns of Bertini**: The columns of Bertini are formed when the renal cortex extends down into the medulla. This extension creates a structure that separates the renal pyramids and provides support to the kidney's overall architecture.

4. **Components of the Columns of Bertini**: Each column consists of lines of blood vessels, urinary tubes, and fibrous material, which help in anchoring the cortex and facilitating the kidney's functions.

5. **Conclusion**: Therefore, the columns of Bertini in the kidney of mammals are formed as the extension of the renal cortex into the renal medulla.

**Final Answer**: The columns of Bertini in the kidney of mammals are formed as the extension of the cortex into the medulla.

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