MICROANATOMY

Detailed explanation-1: -The bottom edge of the epithelial tissue next to the basement membrane is the basal surface. In contrast, the edge of the epithelial tissue facing the lumen or the external environment is called the apical surface.

Detailed explanation-2: -The bottom portion of epithelial tissue is called the basal side. The basal side of the tissue is connected to a basal membrane. The basement membrane is composed of collagen fibers and it function to connect your epithelial tissue to the underlying connective tissue.

Detailed explanation-3: -The basement membrane, also known as basal lamina, is a thin, dense layer of extracellular matrix that lines most human tissues forming the supporting structure and scaffolding for epithelial tissue and separates different types of cells, such as nerve cells and muscle cells.