Describe the cartwheel structure of a centriole.

(N/A) $ \Rightarrow $ $ A $ centrosome is an organelle that usually contains two cylindrical structures called centrioles. They are surrounded by amorphous pericentriolar materials.
$ \Rightarrow $ Both centrioles in a centrosome lie perpendicular to each other, and each has an organization similar to a cartwheel.
$ \Rightarrow $ Each centriole is made up of nine evenly spaced peripheral fibrils of tubulin. These fibrils are absent in the center. Thus, this arrangement is described as $ 9+0 $.
$ \Rightarrow $ Each of the peripheral fibrils is a triplet, consisting of three sub-units (microtubules).
$ \Rightarrow $ Centrioles form the basal body of cilia and flagella.
$ \Rightarrow $ They form spindle fibers in animal cells, which give rise to the spindle apparatus during cell division.