Which of the following connect lateral ventricles or paracoel in brain with ventricle 3 ?

Options

A. Iter
B. Filum terminale
C. Foramen of monro
D. Aquenduct of sylvius

Answer

To answer the question "Which of the following connect lateral ventricles or paracoel in brain with ventricle 3?", we will analyze the options provided and determine which structure serves as the connection between the lateral ventricles and the third ventricle.

### Step-by-Step Solution:

1. **Understand the Structures Involved**:
- The lateral ventricles are two large cavities located in the cerebral hemispheres.
- The third ventricle is a narrow cavity located in the midline of the brain, between the two halves of the thalamus.

2. **Identify the Options**:
- We have four options to consider:
1. Iter
2. Filum terminale
3. Foramen of Monro
4. Aqueduct of Sylvius

3. **Evaluate Each Option**:
- **Iter**: This is a passage that connects the third ventricle to the fourth ventricle. Therefore, it does not connect the lateral ventricles to the third ventricle. **(Incorrect)**
- **Filum terminale**: This is a fibrous extension of the spinal cord that connects to the coccyx (tailbone). It is not related to the brain's ventricular system. **(Incorrect)**
- **Foramen of Monro**: This is the structure that connects the lateral ventricles to the third ventricle. It allows cerebrospinal fluid (CSF) to flow from the lateral ventricles into the third ventricle. **(Correct)**
- **Aqueduct of Sylvius**: This is the canal that connects the third ventricle to the fourth ventricle. It does not connect the lateral ventricles to the third ventricle. **(Incorrect)**

4. **Conclusion**:
- The correct answer is **Foramen of Monro**, as it is the structure that connects the lateral ventricles to the third ventricle.

### Final Answer:
The correct option is **Foramen of Monro**.

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