What is a small structure made of up mictrotubles called?

A small structure made up of microtubules is called a "cilia" or "flagellum," depending on its function and location. These structures are involved in movement and locomotion in various organisms, such as single-celled protists and sperm cells. Microtubules provide structural support and facilitate the beating motion of these appendages. Additionally, microtubules are also key components of the mitotic spindle during cell division.