Cilia and flagella share a common structure, with a microtubular core which has a 9+2 organization with nine paired doublets of microtubules surrounding a central pair to form the axoneme. Axoneme is surrounded by plasma membrane and anchored to the inside of cell by the kinetosome formed from nine microtubular triplets connected to the nine doublets in axoneme. Cilia can fuse to make even bigger structures, creating complex ciliature like cirri and membranelles.