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The Entangled Bank. Definition: Spindle fibers are aggregates of microtubules that move chromosomes during cell division. During prophase of mitosis, spindle fibers form at opposite poles of the cell. During metaphase, spindle fibers extend from the cell poles toward the midpoint of the cell known as the metaphase plate.Chromosomes are held at the metaphase plate by the equal forces of the spindle fibers pushing on the centromeres of the chromosomes.In anaphase, spindle fibers pull sister chromatids toward the spindle poles. Spindle fibers not connected to chromatids lengthen and elongate the cell.uring metaphase, spindle fibers extend from the cell poles toward the midpoint of the cell known as the metaphase plate. Chromosomes are held at the metaphase plate by the equal forces of the spindle fibers pushing on the centromeres of the chromosomes.
On a trailer, the spindles are located at the very ends of the axles and they definitely do serve a purpose. When you're towing, spindles are the part of the trailer axle assembly that the wheel hubs (and wheels) rotate around. Trailer spindles provide a surface for the inner and outer wheel bearings to roll on -- or rather, to roll around. The inner and outer wheel bearings keep the wheel hub and the spindle from actually contacting one another. In other words, the spindles are literally at the center of it all.