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Cross section of a cilium showing the 9 + 2 axoneme. Two dynein arms,
inner and outer (closed arrowheads), of heterogeneous
appearance arise from the complete microtubule of each doublet. Spokes
(open arrowhead) extend from the doublets toward the central
pair. Other densities extend from the central pair and between some of
the outer doublets and the membrane. A heavy glycocalyx
(polysaccharide coat) is found on the outside of the ciliary membrane
as well as the plasma membrane. tt, trichocyst tip; ep,
epiplasm. EM taken on 2/3/69 by R. Allen with Philips 300 TEM. Neg.
47,100X. Bar = 0.1µm.
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