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At the posterior end of the buccal cavity the right side of the
cytopharynx can be seen where it meets the left side. The right side
has a groove in which microtubules lie parallel to the long axis of
the groove (arrow) and are bound to the membrane along their
length. The ends of the ribbed wall lie ventral to this groove and
have a filamentous reticulum (fr) covering the ribs. Bundles of
postoral microtubules border the ribs and extend far into the cytosol.
al, alveolus; nfv, nascent food vacuole; ac,
acidosome; cp mt, cytopharyngeal ribbons; disc,
discoidal vesicles. EM taken on 2/29/80 by R. Allen with Hitachi HU11A
TEM. Neg. 8,500X. Bar = 0.5µm.
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