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Spindle Fibers
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 Related Terms
• Chromatid
• Chromosome
• Microtubules
• Mitosis
 
 
Definition: An aggregate of microtubules that move chromosomes during cell division.

During prophase:
  • Spindle fibers form at opposite poles of the cell.
During metaphase:
  • Spindle fibers extend from the cell poles to align chromosomes at the metaphase plate.
During anaphase:
  • Spindle fibers pull the chromatids toward the spindle poles, and lengthen and elongate the cell.







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