Identify unpaired structure in forebrain 

Options

A. olfactory lobes
B. optic lobes
C. medulla ablongata
D. diencephalon

Answer

To identify the unpaired structure in the forebrain, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Forebrain**:
- The forebrain is the anterior part of the brain and is responsible for various functions such as controlling body temperature, reproductive functions, emotions, sleep, and eating.

2. **Identify the Options**:
- The options provided are:
- A) Olfactory lobes
- B) Optic lobes
- C) Medulla oblongata
- D) Diencephalon

3. **Analyze Each Option**:
- **A) Olfactory Lobes**: These are located at the front of the brain and are responsible for the sense of smell. They are paired structures.
- **B) Optic Lobes**: These are involved in vision and are located posterior to the cerebrum. They are also paired structures.
- **C) Medulla Oblongata**: This structure regulates automatic functions such as digestion and respiration. It is part of the hindbrain and not the forebrain.
- **D) Diencephalon**: This is a short unpaired structure located behind the cerebral hemispheres. It is considered an unpaired structure in the forebrain.

4. **Conclusion**:
- After analyzing the options, the only unpaired structure in the forebrain is the **Diencephalon**.

### Final Answer:
The unpaired structure in the forebrain is the **Diencephalon**.

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