Question

4. From what structures do the spindles originate?

Answer 1

The spindle fibers form out of the centrosome, also known as the microtubule-organizing center, or MTOC. Spindle fibers are formed from microtubules with many accessory proteins which help guide the process of genetic division. The spindle fibers form during cellular division near the poles of the dividing cell.
So basically i believe it originates from the centrosome.