• Centromere is an organelle usually containing two cylindrical structures called centrioles.

• Both the centrioles in a centrosome lie perpendicular to each other in which each has an organisation like the cartwheel.

• They are made of nine evenly spaced peripheral fibrils of tubulin protein.

• Each of the peripheral fibril is a triplet.

• The adjacent triplets are also linked.

• The central part of the proximal region of the centriole is also proteinaceous and called the hub.

• The hub is connected with the tubules of the peripheral triplets by radial spokes made up of protein.