Identify the tissue shown: PCCE

Identify the tissue shown: PCCE

• A. PCCE
• B. Simple columnar epithelium
• C. Transitional epithelium
• D. Stratified Columnar Epithelium

Answer: (A)

Pseudostratified ciliated columnar epithelium is identified by a single layer of tall cells that appear staggered because their nuclei lie at different levels. This gives a false impression of multiple layers, but every cell still contacts the basement membrane. Look for cilia on the apical surface and often goblet cells that produce mucus. These features are typical of the respiratory tract, where the cilia help move mucus out of the airways. This tissue differs from simple columnar epithelium, which is truly a single, uniform layer with cells all lined up along the same plane and usually lacks the apparent multi-level nucleus arrangement. Transitional epithelium, found in the urinary tract, has dome-shaped, stretchable cells and lacks cilia. Stratified columnar epithelium would show several distinct cell layers with a clear, columnar surface layer.

Pseudostratified ciliated columnar epithelium is identified by a single layer of tall cells that appear staggered because their nuclei lie at different levels. This gives a false impression of multiple layers, but every cell still contacts the basement membrane. Look for cilia on the apical surface and often goblet cells that produce mucus. These features are typical of the respiratory tract, where the cilia help move mucus out of the airways.

This tissue differs from simple columnar epithelium, which is truly a single, uniform layer with cells all lined up along the same plane and usually lacks the apparent multi-level nucleus arrangement. Transitional epithelium, found in the urinary tract, has dome-shaped, stretchable cells and lacks cilia. Stratified columnar epithelium would show several distinct cell layers with a clear, columnar surface layer.