Axoneme

An axoneme is the structural core of cilia and flagella, which are hair-like projections on the surface of cells that help with movement. The axoneme is made up of microtubules arranged in a specific pattern—typically nine pairs surrounding a central pair—creating a "9+2" structure. This organization allows cilia and flagella to move in a coordinated manner, facilitating movement in single-celled organisms and helping to propel sperm cells in multicellular organisms. Essentially, the axoneme is crucial for the function of these tiny cellular appendages, enabling them to perform their roles effectively.