The spindle apparatus is a structure that forms during cell division, specifically in the processes of mitosis and meiosis. It is composed of microtubules, which are protein fibers that help separate chromosomes into daughter cells. The spindle apparatus ensures that each new cell receives the correct number of chromosomes, maintaining genetic stability. During cell division, the spindle apparatus originates from the centrosomes, which are located at opposite poles of the cell. As the cell prepares to divide, the spindle fibers attach to the kinetochores on the chromosomes, pulling them apart to opposite ends of the cell. This process is crucial for successful cell division.