The oesophagus is a thin, long tube which extends `_____________` passing through the neck .

Options

A. anterioroly
B. posteriorly
C. horizontaly
D. obliquely

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure**: The esophagus is a thin, long tube that plays a crucial role in the digestive system by transporting food from the mouth to the stomach.

2. **Location of the Esophagus**: It is important to note that the esophagus is located in the neck region, where it runs alongside the trachea (windpipe).

3. **Direction of Extension**: The question asks for the direction in which the esophagus extends as it passes through the neck.

4. **Identifying the Correct Direction**:
- The esophagus is positioned behind the trachea in the neck.
- Therefore, as it extends through the neck, it moves in a posterior direction (towards the back).

5. **Conclusion**: Based on the anatomical position and direction of the esophagus, the correct completion of the sentence is: "The esophagus is a thin, long tube which extends **posteriorly** passing through the neck."

**Final Answer**: The esophagus is a thin, long tube which extends **posteriorly** passing through the neck.

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