Which is not a part of hindbrain?

Options

A. Thalamus
B. Cerebellum
C. Pons Varolii
D. Medulla

Answer

To determine which structure is not a part of the hindbrain, we can analyze the components of the hindbrain and compare them to the options provided.

### Step-by-Step Solution:

1. **Understand the Structure of the Hindbrain**:
- The hindbrain is the lowermost part of the brainstem and is primarily responsible for coordinating various functions such as motor control and maintaining balance.
- It consists of two main parts: the myelencephalon and the metencephalon.

2. **Identify the Components of the Hindbrain**:
- **Myelencephalon**: This part includes the medulla oblongata.
- **Metencephalon**: This part includes the pons (pons Varolii) and the cerebellum.

3. **Examine the Options**:
- **Thalamus**: Located between the cerebral cortex and the midbrain, it is not part of the hindbrain.
- **Cerebellum**: Part of the metencephalon, thus it is a part of the hindbrain.
- **Pons (Pons Varolii)**: Also part of the metencephalon, hence it is part of the hindbrain.
- **Medulla**: Part of the myelencephalon, thus it is included in the hindbrain.

4. **Conclusion**:
- Among the options provided, the thalamus is the only structure that is not a part of the hindbrain. Therefore, the correct answer is **thalamus**.

### Final Answer:
The structure that is not a part of the hindbrain is the **thalamus**.

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