An is a tubular structure lined by epithelial cells that serves as a conduit for the transport of secretions (like sweat, saliva, or milk) or fluids (like urine) from glands or organs to their destination. 1. Structure and Tissue Type
: Ensuring clear separation between luminal contents and the body's interstitium. 3. Developmental Morphogenesis epithelial duct
: Most small and medium-sized ducts are lined by simple cuboidal epithelium , which is optimized for secretion and absorption. An is a tubular structure lined by epithelial
The formation of epithelial ducts involves complex mechanical and genetic processes: or waste (kidneys). : Larger ducts
: Delivering enzymes (pancreas), hormones, or waste (kidneys).
: Larger ducts, such as those in the breast or sweat glands, often feature stratified cuboidal or columnar epithelium to provide structural durability.