A foreign body usually gets arrested in which pa of esophagus?
**Core Concept**
The esophagus is a muscular tube with a narrow diameter, and its anatomy is such that foreign bodies tend to get arrested at a specific location due to the presence of a physiological narrow point.
**Why the Correct Answer is Right**
The correct answer is the location where the esophagus is narrowed due to the cricopharyngeus muscle, which is the upper esophageal sphincter. This muscle is a ring of smooth muscle that surrounds the upper part of the esophagus and is responsible for preventing food from entering the pharynx during swallowing. When a foreign body enters the esophagus, it tends to get arrested at this narrow point due to the resistance offered by the cricopharyngeus muscle. This is why foreign bodies often get stuck at this location, leading to symptoms such as dysphagia and pain.
**Why Each Wrong Option is Incorrect**
**Option A:** is incorrect because the middle esophageal sphincter is not a narrow point in the esophagus where foreign bodies tend to get arrested.
**Option B:** is incorrect because the lower esophageal sphincter is located at the junction of the esophagus and the stomach, and while it is a narrow point, it is not the most common location for foreign bodies to get arrested.
**Option C:** is incorrect because the esophageal stricture is a pathological narrowing of the esophagus, not a physiological narrow point.
**Clinical Pearl / High-Yield Fact**
The cricopharyngeus muscle is a common site for foreign body impaction due to its narrow diameter and the presence of the upper esophageal sphincter.
**Correct Answer:** C. The cricopharyngeus muscle is the upper esophageal sphincter that narrows the esophagus at this location.