Third ventricle of brain is also known as

Options

A. metacoel
B. rhinocoel
C. paracoel
D. diacoel

Explanation

To answer the question "The third ventricle of the brain is also known as," we need to analyze the options provided and understand the terminology associated with the brain's ventricles.

### Step-by-Step Solution:

1. **Understand the Ventricle System**: The brain has a system of interconnected cavities known as ventricles, which are filled with cerebrospinal fluid (CSF). There are four main ventricles: the first and second ventricles (lateral ventricles), the third ventricle, and the fourth ventricle.

2. **Identify the Options**: The options given are:
- Metaceole
- Rhinoceole
- Paraceole
- Diaceole

3. **Evaluate Each Option**:
- **Metaceole**: This term refers to the fourth ventricle, located between the brainstem and the cerebellum. Therefore, it is not the correct answer.
- **Rhinoceole**: This term is associated with the ventricle of the olfactory lobe in the brain of rabbits. It is also not the correct answer.
- **Paraceole**: This term refers to the first and second ventricles (lateral ventricles) present in the cerebral hemisphere. Hence, it is not the correct answer either.
- **Diaceole**: This term is associated with the third ventricle of the brain.

4. **Conclusion**: After evaluating all the options, the correct answer is **Diaceole**, which is another name for the third ventricle of the brain.

### Final Answer:
The third ventricle of the brain is also known as **Diaceole**.