Which of the following parts of brain is concerned with regulating body posture, equilibrium and coordinated rapid muscular activity?

Options

A. Diencephalon
B. Pons
C. Medulla
D. Cerebellum

Answer

To solve the question about which part of the brain is responsible for regulating body posture, equilibrium, and coordinated rapid muscular activity, we can analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Functions Required**: The question asks for a part of the brain that regulates body posture, maintains equilibrium, and coordinates rapid muscular activity.

2. **Evaluate the Options**:
- **Option 1: Diencephalon**: This part of the brain primarily serves as a relay and processing center for sensory information. It does not play a significant role in posture or muscular coordination.
- **Option 2: Pons**: The pons is part of the brainstem and is mainly involved in connecting different parts of the brain, particularly between the cerebrum and cerebellum. It does not primarily regulate posture or equilibrium.
- **Option 3: Medulla**: The medulla oblongata controls autonomic functions such as breathing and heart rate. It does not focus on body posture or muscular coordination.
- **Option 4: Cerebellum**: The cerebellum is specifically known for its role in regulating body posture, maintaining balance (equilibrium), and coordinating rapid muscular activities.

3. **Select the Correct Option**: Based on the evaluations, the correct answer is **Cerebellum**.

### Final Answer:
The part of the brain concerned with regulating body posture, equilibrium, and coordinated rapid muscular activity is the **Cerebellum**.