||ciliary transition zone
cilial transition zone,
cilium transition zone,
||A region of the cilium between the basal body and proximal segment that is characterized by Y-shaped assemblages that connect axonemal microtubules to the ciliary membrane. The ciliary transition zone appears to function as a gate that controls ciliary membrane composition and separates the cytosol from the ciliary plasm.
||GO: Cellular Component [GO:0035869]