: Larger ducts, such as those in the breast or sweat glands, often feature stratified cuboidal or columnar epithelium to provide structural durability.
: To maintain a strict barrier—such as in renal collecting ducts —epithelial cells are joined by tight junctions to prevent the leakage of fluids into surrounding tissues. 2. Key Biological Functions
: Delivering enzymes (pancreas), hormones, or waste (kidneys). epithelial duct
: Most small and medium-sized ducts are lined by simple cuboidal epithelium , which is optimized for secretion and absorption.
The cellular architecture of a duct is specialized based on its location and function: : Larger ducts, such as those in the
: Cells within the duct (e.g., in salivary glands) can actively modify the ion concentration or pH of the fluid they transport.
: Ensuring clear separation between luminal contents and the body's interstitium. 3. Developmental Morphogenesis : Ensuring clear separation between luminal contents and
The formation of epithelial ducts involves complex mechanical and genetic processes: