Figure 1
From: Transmission electron microscopy study of suspected primary ciliary dyskinesia patients
Normal ciliary ultrastructure. (A) Tip: cross-sections from the tip of the cilium which consists of single microtubules. It should not be considered a defect. (B) Axoneme: it consists of a central pair of microtubules surrounded by nine peripheral microtubule doublets bond to the center pair by supporting radial spokes (known as the 9 + 2 arrangement) Each doublet possesses outer and inner dynein arms. (C) Base: cross-section at the base of the cilium, where the central pair is not present. Y-shaped linkers bond microtubule doublets together.
