It assembles at the centromeric region of the chromosome. It is a giant, multi-layered protein structure and it is the place where spindle fiber is attached during cell division and its protein also helps to hold the sister chromatids together.
Spindle fibers- it forms a protein structure and divides the genetic material in a cell.during board types of cell division that is mitosis and meiosis, spindle fibers divide the chromosomes in a parental cell into two daughter cells. Spindle fibers are called mitotic spindle during mitosis and meiotic spindle during meiosis.
-When the nuclear division begins, centrioles move to the opposite ends of the cell forming cell poles and microtubules (long protein fibers) extend from the centriole in all the directions. This protein fiber is called spindle fibers.
-Kinetochores is a protein complex. Some microtubules (spindle fibers)help to attach the pores to the chromosome by connecting to kinetochores. Kinetochores located in the middle of chromosomes around Centromeres.