Question

which epithelial type is highlighted?

pseudostratified columnar epithelium
stratified squamous epithelium
simple columnar epithelium
transitional epithelium

Explanation:

Analyze the highlighted region

The image shows a histological section of tissue with a yellow highlighted layer at the apical surface. This highlighted layer consists of epithelial cells lining a lumen or surface.

Examine cellular characteristics

Using the Epithelial Tissue Types knowledge point, we observe the features of the highlighted layer:

• The nuclei are located at different heights within the cells, giving a false appearance of stratification.
• The cells are tall and column-shaped, extending to the apical surface.
• Cilia are visible projecting from the apical surface into the lumen.

Identify the specific epithelium

Using the Pseudostratified Columnar Epithelium knowledge point, we confirm that this tissue is pseudostratified columnar epithelium. The presence of cilia on the apical surface and nuclei at multiple levels within a single layer of columnar cells are key diagnostic features of this tissue type, commonly found in the respiratory tract.

Evaluate the given options

• pseudostratified columnar epithelium: Matches all observed histological features, including the columnar shape, varied nuclear heights, and apical cilia.
• stratified squamous epithelium: Incorrect; this tissue consists of multiple layers of flattened cells, which is not shown here.
• simple columnar epithelium: Incorrect; simple columnar epithelium has a single row of uniform nuclei aligned near the basal region.
• transitional epithelium: Incorrect; transitional epithelium features dome-shaped umbrella cells at the surface and lacks cilia.

Answer:

• pseudostratified columnar epithelium (Correct answer)
• stratified squamous epithelium
• simple columnar epithelium
• transitional epithelium