Talk about the structure of microtubules.

Hollow tubular structures that occur in nearly all animal cells, components of the spindle of division of the basal body of cilia and flagella of centrioles and core of flagella and cilia, outer diameter is 24-25 nm and wall thickness is about 5nm, the length is variable depending on the structure in which it is found. Highly dynamic since they undergo polymerization and depolymerization during various physiological processes.