The phrase "intestinal epithelium" refers to the inner lining or cells that make up the wall of the intestine. It acts as a protective barrier and helps absorb nutrients from the food we eat. Full definition
The epithelium's maturation into a villus intestinal epithelium with long finger - like extensions was helped along by co-culturing human intestinal microvascular endothelial cells on the opposite side of the shared matrix - coated porous membrane in the «vascular» channel where they assembled a surrogate blood vessel with a hollow lumen through which feeding medium was flowed. (sciencedaily.com)
Betaine aids in the osmoregulation of duodenal epithelium of broiler chicks, and affects the movement of water across the small intestinal epithelium in vitro (academic.oup.com)