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Cross section through a radial arm. The collecting canal (cc)
occupies the center of the arm whose membrane is supported by the
radial microtubular ribbon (mt) which has now divided into at
least six segments and surrounds the canal. Gaps (arrowheads)
between the segments are where the mass of membrane tubules of the
smooth spongiome (ss) opens into the canal. Decorated tubules
(ds) occurring in bundles form the peripheral layer of the
radial arm. EM taken on 5/2/79 by R. Allen with Hitachi HU11A TEM.
Neg. 18,000X. Bar = 0.2µm.
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