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At its most distal extremity the stalk ends in a clump of sheath-like
fibers with embedded bacteria. The spasmoneme itself seems to end in a
tight association with its surrounding plasma membrane. This is
possibly the only point where the myonemal fibers meet the plasma
membrane without an intervening alveolus. However there may be
microtubules or modified basal bodies linking the spasmonemal fibers
to the plasma membrane. The outer surface of the plasma membrane shows
striations (at high magnification) next to the holdfast. EM taken on
2/16/72 by R. Allen with Hitachi HU11A TEM. Neg. 19,500X. Bar = 0.5µm.
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