During cell division, the<unk>  pulls together the chromosomes into the two daughter cells.
The<unk>  is a structure of the eukaryotic cytoskeleton involved in mitosis and meiosis, often referred to as the mitotic<unk>  during mitosis and the meiotic<unk>  during meiosis. Its function is to segregate chromosomes during cell division (either mitosis or meiosis) to  the daughter cells. It consists of a bundle of microtubules joined at the ends but spread out in the middle, vaguely ellipsoid in shape. In the wide middle portion, known as the<unk>  midzone, antiparallel microtubules are bundled by kinesins. At the pointed ends, known as<unk>  poles, microtubules are nucleated by the centrosomes in the cells of most animals.
During<unk>  assembly in prometaphase, some of the<unk> 's microtubules attach to the kinetochores that assemble on the centromere portion of the chromosomes. The chromosomes are pulled into alignment along the<unk>  midzone to form the metaphase<unk> . Once all the chromosomes are aligned with sister chromatids pointing to opposite ends of the<unk> , the cell enters anaphase, in which the chromatids separate and move toward their respective poles. Since the center of the<unk>  specifies the plane along which the cell will divide during cytokinesis, this ensures that each daughter cell will receive one of each chromatid. The mitotic kinase aurora A is required for proper<unk>  assembly and separation.
According to a recent publication, lamin B is a key component of the<unk>  matrix helping microtubule assembly. The mitotic<unk>  will not form without it.
Spindle apparatus
Growth cone
Stereocenter
Agar plate
Vesicle 
Climbing fiber
Atlas 
Cuticle