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The connection of an ampulla to the CV when the ampulla is attached
to and open to the CV. Just before systole this connection will be
severed from the CV. There is no sign here of constriction fibers to
account for this severing. Presumably the increase in membrane tension
that the CV membrane undergoes at the rounding phase (see Tani, Allen
and Naitoh, J. Cell Sci. 114:785-795, 2000) just prior to systole puts
strain on the CV-ampullae connections and causes these restricted
necks to undergo stress and severing. Attachment of membranes to the
microtubular ribbons together with CV rounding may pull the membrane
apart permitting fission to occur. Whatever the reason it appears that
the CV-ampullae connections undergo fission and then reform in each CV
cycle. EM taken on 3/21/80 by R. Allen with Hitachi HU11A TEM. Neg.
12,250X. Bar = 0.5µm. Published in J. Protozool. 35:63-71, 1988.
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