"microtubule." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/microtubule>.
microtubule. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/microtubule
Any of the cylindrical hollow tubulin-containing structures that are found in the cytoplasm, cilia, and flagella of eukaryotic cells and are involved in determining cell shape and structure and directing the movement of organelles and chromosomes. Microtubules, along with microfilaments and intermediate filaments, make up a cell's cytoskeleton.