Pharyngeal tonsil is lined by?
**Core Concept**
The pharyngeal tonsil, also known as the adenoids, is a mass of lymphoid tissue located in the posterior wall of the nasopharynx. It plays a crucial role in the immune system, particularly in children, by filtering pathogens from the air we breathe.
**Why the Correct Answer is Right**
The correct answer is **C. Pseudostratified columnar epithelium**. This type of epithelium is characteristic of the nasopharynx, where the pharyngeal tonsil is located. The pseudostratified columnar epithelium is composed of multiple layers of cells that appear to be layered due to the varying heights of the nuclei.
**Why Each Wrong Option is Incorrect**
* **Option A:** Stratified squamous epithelium is typically found in areas that are exposed to high friction and abrasion, such as the oral cavity.
* **Option B:** Simple cuboidal epithelium is found in glands and ducts, which is not characteristic of the pharyngeal tonsil.
* **Option D:** Simple columnar epithelium is found in areas such as the small intestine, where absorption of nutrients occurs.
**Clinical Pearl / High-Yield Fact**
The pharyngeal tonsil is a common site of infection, particularly in children, leading to symptoms such as nasal congestion, sore throat, and fever. It is essential to diagnose and treat pharyngeal tonsillitis promptly to prevent complications.
**Correct Answer: C. Pseudostratified columnar epithelium**