Routing Protocol Definition. A routing protocol is a set of rules used by routers to determine the most appropriate paths into which they should forward packets towards their intended destinations.
Spindle fibers are protein structures that form early in mitosis, or cell division. They consist of microtubules that originate from the centrioles, two wheel-shaped bodies located in the centromere area of the cell. The centromere is also known as the microtubule organizing center.
Spindle Fibers in Mitosis. 1  During prophase of mitosis, spindle fibers form at opposite poles of the cell. 2  During metaphase, spindle fibers called polar fibers extend from the cell poles toward the midpoint of the cell known as the metaphase plate. 3  In anaphase, spindle fibers shorten and pull sister chromatids toward the spindle poles.