Which one of the following statement is incorrect?

Options

A. a) The medullary zone of kidney is divided into a few conical masses called medullary pyramids projecting into the calyces.
B. b) Inside the kidney the cortical region extends in between the medullary pyramids as renal pelvis.
C. c) Glomerulus along with bowman's capsule is called the renal corpuscle.
D. 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 determine which statement is incorrect, we will analyze each of the provided statements about the structure and function of the kidneys.

### Step-by-Step Solution:

1. **Analyze Statement A**:
- Statement A claims that the medullary zone of the kidneys is divided into conical masses known as medullary pyramids, which project into the calyx.
- **Evaluation**: This statement is correct. The medullary pyramids are indeed conical structures that project into the calyces of the kidney.

2. **Analyze Statement B**:
- Statement B states that the cortical region extends between the medullary pyramids as renal pelvis.
- **Evaluation**: This statement is incorrect. The cortex does not extend as the renal pelvis; instead, the cortex forms structures known as renal columns (or columns of Bertini) between the medullary pyramids. The renal pelvis is a separate structure that collects urine from the calyces.

3. **Analyze Statement C**:
- Statement C asserts that the glomerulus along with Bowman's capsule is known as the renal corpuscle.
- **Evaluation**: This statement is correct. The glomerulus and Bowman's capsule together form the renal corpuscle, also referred to as the Malpighian body.

4. **Analyze Statement D**:
- Statement D states that the renal corpuscle, proximal convoluted tubule, and distal convoluted tubule of the nephron are situated in the cortical region of the kidney.
- **Evaluation**: This statement is also correct. The renal corpuscle and both convoluted tubules are located in the cortex, while the loop of Henle extends into the medulla.

### Conclusion:
- The incorrect statement is **Statement B**, which incorrectly describes the relationship between the cortical region and the renal pelvis.

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

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