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Spindle fibers are composed of a protein called myosin and originate from a cell organelle called the centriole
myofibrils
Centriole.
Spindle fibers are formed by micro tubules.They are organized by centrioles.
A centriole is a type of microtubule-producing center. It is a cylindrical organelle which is responsible for the development of spindle fibers in cell division.
spindle fibers
Centriole (:
Muscle cells are called fibers.
Nuclear envelope. It breaks down and it's microtubules form the fibers
Characteristically banded (sarcromeres) long cells with a lot of nuclei. The cell fibers also have a bunch of smaller cells around them, fibroblasts, which can fuse with the fibers if need be.
VENEER
In animal cells... Centrioles, asters and the spindle fibers.