Fig. 5

Cilium assembly. In vertebrates, the ciliary vesicle forms at the tips of the ciliary transition fibres attached to the basal body. The ciliary vesicle then fuses with the plasma membrane forming the ciliary pocket and ciliary membrane. The axoneme extends from the basal body and the transition zone is assembled with its distinctive Y-shaped links and ciliary necklace. Further axonemal assembly causes the cilium to elongate