Centrioles: These are cylindrical sub cellular cell structures composed of a protein tubulin. They act in microtubule formation.

Centrosomes: These are the centers which control the organisation of the microtubules that appear in prophase and then move to the polar ends of the cell.

Centromeres: This is the part of the chromosome where the DNA is wound tighter than the other DNA giving an indention look to it. It is also important in counting chromosomes.

Kinetochore: These lie on the centrosomes of the chromosomes and is where the mitotic spindle connects to. It is the structure that mitotic spindles connect to pull sister chromatids apart during mitosis.