Practically in all eukaryotic cells in a gialoplazma it is possible to see the long not branching microtubules. In large numbers they are found in cytoplasmatic shoots of nervous cages, fibroblast and other cages changing the form. They can be allocated or it is possible to secrete the proteins forming them: these are the same tubulina with all their properties.
The principal functional value of such microtubules of cytoplasm consists in creation of elastic, but at the same time steady intracellular framework (cytoskeleton) necessary for maintenance of a form of a cage.
In not sharing (interfazny) cage the system of microtubules develops in connection with a special cellular organella — центриолью which is a place where there is an initial polymerization of tubulin and growth of microtubules of a cytoskeleton.
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