What is put together to form the spindle?

The spindle is formed primarily from microtubules, which are protein filaments made up of tubulin dimers. During cell division, specifically mitosis and meiOSis, these microtubules organize into a structure known as the spindle apparatus, which helps segregate chromosomes into the daughter cells. Additional proteins, such as motor proteins and spindle assembly factors, also play crucial roles in stabilizing and regulating the spindle's function.