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The ciliary membrane has a closely adhering external coat as well as
a sparse coat of long fibers that protrude from its exterior surface.
These are probably polysaccharide in composition. As with other cilia
at its distal end the axoneme collapses first from a 9 doublet and 2
singlet structure to 9 singlets surrounding the 2 central singlets and
finally, next to its tip, all 9 singlets end and the 2 central
singlets extend to the end where they form a terminal cap. All dynein
arms (arrow) and spokes (arrowheads) end at the level
that doublets change into singlets. Densities of the spokes near the
central singlets appear as triplets separated by a space
(bracket). EM taken on 5/28/69 by R. Allen with Philips 300
TEM. Neg. 14,800X. Bar = 0.2µm. Published in Poste and Nicolson
(eds.), Membrane Fusion, Elsevier/North Holland Biomed. Press, p.731,
1978.
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