Transitional Epithelium: Urothelium

This lecture covers the characteristics of transitional epithelium, also known as urothelium, in the urinary bladder and ureter. It explains the structural changes in the epithelium from a relaxed to a stretched bladder, highlighting the differences in cell shape and arrangement. The lecture also discusses the controversy surrounding whether the transitional epithelium is stratified or pseudostratified, providing insights into the cellular composition and responses to tensional forces. Additionally, it explores the impermeability of the epithelium to salts and water, its stratified nature in different parts of the urinary system, and the presence of uroplakins. Various histological images and diagrams are used to illustrate the key points.