Which one of the following statements is incorrect?

Options

A. The medullary zone of kidney is divided into a few conical masses called medullary pyramids projecting into the calyces
B. Inside the kidney the cortical region extends in between the medullary pyramids as renal pelvis
C. Glomerulus along with Bowman's capsule is called the renal corpuscle
D. Renal corpuscle, Proximal Convoluted Tubule (PCT) and Distal Convoluted Tubule (DCT) of the nephron are situated in the cortical region of kidney

Explanation

To solve the question "Which one of the following statements is incorrect?", we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Understand the Structure of the Kidney**:
- The kidney consists of two main regions: the outer cortex and the inner medulla. The medulla is further divided into structures known as medullary pyramids.

2. **Evaluate the First Statement**:
- The first statement claims that the medullary zone of the kidneys is divided into conical masses called medullary pyramids that project into the calyces.
- This statement is **true**. The medullary pyramids are indeed conical structures that project into the renal calyces.

3. **Evaluate the Second Statement**:
- The second statement suggests that the cortical region extends between the medullary pyramids as renal pelvis.
- This statement is **incorrect**. The cortical region actually extends between the medullary pyramids as renal columns (also known as columns of Bertini), not as renal pelvis.

4. **Evaluate the Third Statement**:
- The third statement states that the glomerulus along with the Bowman's capsule is called the renal capsule.
- This statement is **true**. The combination of the glomerulus and Bowman's capsule forms the renal corpuscle, often referred to as the renal capsule.

5. **Evaluate the Fourth Statement**:
- The fourth statement claims that the renal corpuscle, PCT (Proximal Convoluted Tubule), and DCT (Distal Convoluted Tubule) of the nephron are situated in the cortical region.
- This statement is **true**. All these structures are located in the renal cortex.

6. **Conclusion**:
- After evaluating all the statements, we find that the second statement is the only incorrect one. Therefore, the answer to the question is the second statement.

### Final Answer:
The incorrect statement is: "Inside the kidney, the cortical region extends in between the medullary pyramids as renal pelvis."