Epithelial tissue cells are the most common cells found in the human body. They are one of four primary animal tissues: epithelial, mesenchymal, nervous and lymphoid tissue. Many epithelial tissues include some mesenchymal tissue (also referred to as connective tissue).
Epithelial cells mostly line surfaces: skin, mouth, sinuses, inner linings e.g., GI tract, gallbladder, urinary bladder, collecting tubules of kidney, and bile ducts.
This collection seeks to answer the following questions: Where are epithelial cells found? What functions do they perform? What are the different types? What are the different structures? What do they look like?