Trachea is a straight tube extending up to the mid-thoracic cavity, which divides at the level of

Options

A. `2^(nd)` cervical vertebra
B. `5^(th)` cervical vertebra
C. `5^(th)` thoracic vertebre
D. `5^(th)` lumbar vertebra

Answer

To solve the question regarding the level at which the trachea divides, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Trachea**: The trachea, commonly known as the windpipe, is a straight tube that extends from the larynx down to the thoracic cavity.

2. **Identify the Location of Division**: The trachea divides into two primary bronchi, which lead to the lungs. This division occurs at a specific vertebral level in the thoracic region.

3. **Analyze the Options Provided**: The options given are:
- 2nd cervical vertebra
- 5th cervical vertebra
- 5th thoracic vertebra
- 5th lumbar vertebra

4. **Eliminate Incorrect Options**:
- The cervical vertebrae (2nd and 5th) are located in the neck region, which is above the thoracic cavity. Since the question specifies the mid-thoracic cavity, these options can be eliminated.
- The 5th lumbar vertebra is located in the lower back, which is also not relevant to the thoracic cavity.

5. **Identify the Correct Answer**: The only option that corresponds to the thoracic cavity is the 5th thoracic vertebra. This is where the trachea divides into the left and right primary bronchi.

6. **Conclusion**: Therefore, the trachea divides at the level of the 5th thoracic vertebra.

### Final Answer:
The trachea divides at the level of the **5th thoracic vertebra**.

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