Passavant ridge is formed by-
**Core Concept**
The Passavant ridge is a mucosal fold in the nasopharynx, which plays a crucial role in the pharyngeal phase of swallowing. It is a normal anatomical structure that forms during the act of swallowing, and its correct identification is essential for diagnosing and managing various swallowing disorders.
**Why the Correct Answer is Right**
The Passavant ridge is formed by the elevation of the superior constrictor muscle of the pharynx, specifically the palatopharyngeus muscle. During swallowing, the palatopharyngeus muscle contracts and pulls the pharyngeal mucosa upward, creating the Passavant ridge. This mucosal fold helps to prevent the entry of food and liquids into the nasal cavity during swallowing. The correct formation of the Passavant ridge is essential for the proper coordination of swallowing and the prevention of aspiration.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the Passavant ridge is not formed by the tensor veli palatini muscle, which is involved in the elevation of the soft palate during speech and swallowing.
* **Option B:** This option is incorrect because the buccopharyngeal fascia is not directly involved in the formation of the Passavant ridge.
* **Option C:** This option is incorrect because the Passavant ridge is not formed by the levator veli palatini muscle, which is involved in the elevation of the soft palate during speech and swallowing.
**Clinical Pearl / High-Yield Fact**
The Passavant ridge is an important landmark in the nasopharynx that can be palpated during a nasopharyngoscopy. Its correct identification can help clinicians diagnose and manage various swallowing disorders, including dysphagia and aspiration.
**Correct Answer: C. The palatopharyngeus muscle.**