Which of the following is not correct ?

Options

A. The blood vessel leading to the glomerulus is called the afferent arteriole.
B. Juxtamedullary nephrons, peritubular capillaries and Bowman's capsule all lie in the cortical region of the kidney .
C. Cortical nephrons have no or highly reduced vasa recta .
D. Vasa recta run parallel to the Henle's loop in juxtamedullary nephrons but the flow of blood inside them is in the opposite direction .

Answer

To solve the question "Which of the following is not correct?" regarding nephrons, we will analyze each statement provided in the video transcript step by step.

### Step 1: Analyze the first statement
- **Statement**: "The blood vessel leading to the glomerulus is called afferent atriole."
- **Analysis**: This statement is correct. The afferent arteriole is indeed the blood vessel that carries blood to the glomerulus.

### Step 2: Analyze the second statement
- **Statement**: "Juxtamedullary nephron, peritubular capillaries and Bowman capsule all lie in the cortical region of the kidney."
- **Analysis**: This statement is incorrect. Juxtamedullary nephrons have their loop of Henle extending deep into the medulla, not the cortex. Therefore, this statement is not correct.

### Step 3: Analyze the third statement
- **Statement**: "Cortical nephrons have no or highly reduced vasa recta."
- **Analysis**: This statement is correct. Cortical nephrons do have a reduced or absent vasa recta, which are more prominent in juxtamedullary nephrons.

### Step 4: Analyze the fourth statement
- **Statement**: "Vasa recta run parallel to the loop of Henle in juxtamedullary nephrons but the flow of blood inside them is in the opposite direction."
- **Analysis**: This statement is also correct. The vasa recta do run parallel to the loop of Henle in juxtamedullary nephrons, and the blood flow in the vasa recta is indeed in the opposite direction to the flow in the loop of Henle.

### Conclusion
After analyzing all the statements, the one that is not correct is the second statement regarding the location of juxtamedullary nephrons, peritubular capillaries, and Bowman capsule.

### Final Answer
The statement that is not correct is: "Juxtamedullary nephron, peritubular capillaries and Bowman capsule all lie in the cortical region of the kidney."

---