Where is the cytoskeleton found ?
The cytoskeleton is a network of protein fibers that lies within eukaryotic cells. In the simplest eukaryotes, the cytoskeleton consists of two distinct filament systems – microfilaments, built of the protein actin, and microtubules built of the protein tubulin. A substantial number of assessory/associated proteins regulate microfilament and microtubule organization and function. Metazoans (multicellular animals) have an addition cytoskeletal systems — intermediate filaments – which provides cells with enhanced resilience to mechanical deformation. In addition to these well recognized cytoskeletal systems, there are other internal mechanical systems in eukaryotic cells; these include a network of proteins than underlies the plasma membrane and a network of filaments, the lamina, that underlies the inner nuclear envelope in many (but not all) eukaryotes.
