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. Now, if we take a small cross sectional area, a cross sectional picture of this flagella, and we zoom in and we look at the two dimensional slides, we basically get the following arrangement of microtubules. So it consists of nine doubled pairs of microtubules that create this circular like diagram, circular like arrangement around a section of two central microtubules. And this arrangement of nine to two, known as nine, is known as nine plus two.