 A number of "polar microtubules" find and interact with corresponding polar microtubules from the opposite centrosome to form the mitotic spindle.Although the kinetochore structure and function are not fully understood, it is known that it contains some form of molecular motor.When a microtubule connects with the kinetochore, the motor activates, using energy from ATP to "crawl" up the tube toward the originating centrosome.