Prior to metaphase, the mitotic spindle is constructed by lengthening microtubules that extend from each centrosome.
In metaphase, the kinetochore microtubules have attached each pair of sister chromatids, and the nonkinetochore microtubules overlap extensively at the metaphase plate.
During anaphase, the kinetochore microtubules shorten as the chromosomes move toward the poles of the cell. At the same time, the nonkinetochore microtubules lengthen and push past each other, elongating the cell.
By the end of telophase, all the microtubules associated with the mitotic spindle have disassembled.