hollow tubes of internal diameter 12-15 nm and external diameter 24 nm found in a wide variety of eukaryotic cells

Microtubules are found in biological cells as a part of the cytoskeleton. They are hollow tubes whose walls consist of 13 columns of tubulin molecules. Its main functions are to maintain a cell's shape, cell motility, chromosome movement in cell division, and organelle movement. They look like hollow noodles which transmit signals to our nerves[1][2]

Structure of a microtubule.


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  2. Howard J; Hyman AA (Feb 2007). "Microtubule polymerases and depolymerases". Current Opinion in Cell Biology. 19 (1): 31–5. doi:10.1016/j.ceb.2006.12.009. PMID 17184986.{{cite journal}}: CS1 maint: multiple names: authors list (link)