The axoneme is the core structure of cilia and flagella, which are hair-like projections found on the surface of many cells. It is composed of a specific arrangement of microtubules, typically organized in a "9+2" pattern, meaning there are nine pairs of microtubules surrounding two central microtubules. This structure is crucial for the movement of cilia and flagella, allowing cells to swim or move fluids across their surfaces. In addition to its role in motility, the axoneme is essential for the proper functioning of various cellular processes. It is found in many organisms, including eukaryotic cells, such as those in humans and plants. The axoneme's structure and function are vital for reproduction, sensory perception, and maintaining the health of tissues.