The epithelium is connected to the underlying connective tissues by the basement membrane.
The basement membrane is a thin, fibrous structure that plays a crucial role in supporting the epithelium. It acts as a barrier and a substratum for the epithelial cells, anchoring them in place and providing the necessary nutrients from the underlying connective tissue. Comprised mainly of collagen and glycoproteins, this membrane separates the epithelial layer from the connective tissue beneath it, allowing for proper organization and function of the tissues.