Which of the following organs in mammals does not consist of central "medullary' region surrounded by a cortical region

Options

A. Ovary
B. Adrenal
C. Liver
D. Kidney

Answer

To solve the question, "Which of the following organs in mammals does not consist of a central 'medullary' region surrounded by a cortical region?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- The term "medullary" refers to the inner region of an organ, while "cortical" refers to the outer region. Many organs in mammals have this structure.

2. **Identify the Organs**:
- The question provides options that likely include various organs. Common organs to consider include the kidney, adrenal glands, ovary, and liver.

3. **Analyze Each Organ**:
- **Kidney**: The kidney has a medullary region (the renal medulla) surrounded by a cortical region (the renal cortex).
- **Adrenal Glands**: The adrenal glands also have a medullary region (the adrenal medulla) surrounded by a cortical region (the adrenal cortex).
- **Ovary**: The ovary has a medullary region (the medulla) surrounded by a cortical region (the cortex).
- **Liver**: The liver does not have a distinct medullary and cortical structure. Instead, it has a more uniform structure without these distinct layers.

4. **Conclusion**:
- Based on the analysis, the organ that does not consist of a central medullary region surrounded by a cortical region is the **liver**.

### Final Answer:
The organ in mammals that does not consist of a central "medullary" region surrounded by a cortical region is the **liver**.

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