And one of the centrioles, the dota centriole, basically creates the basal body. So let's suppose we have this is our cell, this is the cytoplasm. One of the centrioles of the central stone creates the basal body. And what the basal body does is it basically creates more of these microtubules that extend outward and that essentially creates our flagella. Now, the flagella is enclosed inside our plasma membrane that is continuous with our plasma membrane of the rest of the cell. So we see for eukaryotic flagella, it actually contains that plasma membrane as shown in this diagram.