Fig. 7. Diagrammatic reconstruction of the proximal part of 

 a cilium, the transition region and the basal body (Anodonta). 



A to G show transverse sections at the levels indicated ; they 

 are all orientated with the plane of beat up and down in. the 

 figure, with the effective stroke towards the top. H shows a 

 median longitudinal section in the plane of the central fibrils; 

 the outer fibril on the right is turned sideways to show it more 

 clearly (from Gibbons, 1961b). 



a, arm; bb, basal body; bf, basal foot; bp, basal plate; 

 c, ciliary shaft; cf, central fibril; cm, ciliary membrane; cs, 

 central sheath; mv, microvillus of brush border; of, outer 

 fibril ; rl, radial link ; sC, distal end of subfibril C ; sf, secondary 

 filament ; tf, transitional filament ; tr, transitional region of the 



cilium. 



