So the side of the cell that points towards the lumen side, the cavity, is known as the apical side, while the side attached to our basement membrane, it's called the basil lateral side. Now, the basement membrane is also sometimes known as the basal lamina or the basal membrane. Now, this basement membrane acts as an attachment point for the cells. It holds those cells together and it consists of specialized proteins such as, for example, collagen. Now, epithelial cells, as we mentioned earlier, are found in our digestive system as well as in many other places of our body. For example, our skin.