Explain Centrosome and Centrioles.

(N/A) $\Rightarrow$ Centrosome is an organelle usually containing two cylindrical structures called centrioles. They are surrounded by amorphous pericentriolar materials.
$\Rightarrow$ Both the centrioles in a centrosome lie perpendicular to each other,in which each has an organization like the cartwheel.
$\Rightarrow$ They are made up of nine evenly spaced peripheral fibrils of tubulin. Each of the peripheral fibril is a triplet. The adjacent triplets are also linked.
$\Rightarrow$ The central part of the proximal region of the centriole is also proteinaceous and called the hub,which is connected with tubules of the peripheral triplets by radial spokes made of protein.
$\Rightarrow$ The centrioles form the basal body of cilia or flagella,and spindle fibres that give rise to spindle apparatus during cell division in animal cells.