A study was done by collecting an X rays of all the patients who has ingested a foreign body in the past . It was observed that in most of the cases foreign body was found to be lodged in the right lung . All could be the possible reasons for the lodgement of foreign body in the right bronchus except :
**Core Concept**
The concept being tested here is the anatomy of the airway bifurcation and the factors influencing the lodgement of foreign bodies in the respiratory tract. The right bronchus is more likely to be affected due to its anatomical characteristics, which predispose it to foreign body aspiration.
**Why the Correct Answer is Right**
The right main bronchus is more vertical and wider compared to the left main bronchus, making it a more direct path for inhaled foreign bodies. Additionally, the right bronchus has a more acute angle with the trachea, which can cause foreign bodies to be deflected into it. These anatomical features, combined with gravity, increase the likelihood of foreign body lodgement in the right lung.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the right bronchus is not smaller in diameter than the left bronchus. In fact, it is wider, which contributes to its increased susceptibility to foreign body lodgement.
* **Option B:** This option is incorrect because the right bronchus is not more lateral than the left bronchus. Its vertical orientation and wider diameter are the key factors contributing to foreign body lodgement.
* **Option C:** This option is incorrect because the right bronchus is not more narrow than the left bronchus. Its wider diameter, combined with its vertical orientation, increases the likelihood of foreign body lodgement.
* **Option D:** This option is incorrect because it is a plausible reason for foreign body lodgement in the right bronchus. The right bronchus is indeed more vertical and wider than the left main bronchus, making it a more direct path for inhaled foreign bodies.
**Clinical Pearl / High-Yield Fact**
To remember the anatomical characteristics that predispose the right bronchus to foreign body lodgement, recall the mnemonic "Right is Might" - the right bronchus is wider, more vertical, and more prone to foreign body aspiration due to its anatomical features.
**Correct Answer: B.**