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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.
In other words, the muscle spindle is more sensitive to stretch when its intrafusal fibers are partially contracted then when they are not. The degree of contraction of the intrafusal fibers and thus the sensitivity of the muscle spindle is controlled by the activity of the gamma motor neurons.uscle spindles are encapsulated units within the belly of a muscle that lie parallel to the muscle fibers, stretching when the muscle is stretched and shortening when the muscle contracts. Thus they are uniquely situated to detect slight changes in muscle tone.