In the movable shaft of a cilium a transverse section resembles this PS. The arrangement of 9 PERIPHERALLY spaced MICROTUBULES and 2 CENTRAL microtubules is termed an AXIAL FILAMENT COMPLEX. The outer tubules are constructed of a complete inner tubule (A) and a c-shaped incomplete tubule (B). This 9 + 2 arrangement is common to virtually all motile cell processes.
