Passavant ridge is formed by
**Core Concept**
Passavant ridge is a mucosal fold in the nasopharynx that plays a crucial role in the upper airway. It is a critical anatomical structure that can be affected in various respiratory and neurological conditions.
**Why the Correct Answer is Right**
The Passavant ridge is formed by the contraction of the superior constrictor muscle of the pharynx, specifically the part that is attached to the pterygoid hamulus. When the superior constrictor muscle contracts, it elevates the mucosa of the nasopharynx, creating the Passavant ridge. This anatomical feature is essential for the proper functioning of the upper airway and can be affected in conditions such as nasal obstruction or neurological disorders.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect, as the Passavant ridge is not formed by the tensor veli palatini muscle, which is involved in the elevation of the soft palate.
**Option B:** Incorrect, as the Passavant ridge is not formed by the palatopharyngeus muscle, which is involved in the formation of the palatopharyngeal arch.
**Option C:** Incorrect, as the Passavant ridge is not formed by the levator veli palatini muscle, which is involved in the elevation of the soft palate.
**Clinical Pearl / High-Yield Fact**
The Passavant ridge is an important anatomical landmark that can be affected in various conditions, including nasal obstruction, sleep apnea, and neurological disorders. It is essential to recognize the Passavant ridge during endoscopic examination of the nasopharynx.
**Correct Answer:** D.