Cilia - TEM

Transmission electron microscope image of a thin section cut through the bronchiolar area of lung
(mouse), showing cilia cross-sections. The inside of the cilium contain precisely arranged microtubles, the axoneme. The axoneme has a central unit containing two single microtubules and nine peripheral doublet microtubules (known as the "9+2"). Dynein sidearms project from the A tubule of each doublet. JEOL 100CX TEM

Image courtesy of Louisa Howard.