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The cytopharynx in cross section showing the cytopharyngeal
microtubular ribbons lying in the plane of the section. Some discoidal
vesicles (disc), some containing HRP label, are also seen in
planar view. Acidosomes (ac) also accumulate near the growing
nascent digestive vacuole. The lower ribbon has 10 microtubules
showing while, what are probably two ribbons lying side by side, show
22 microtubules in the upper ribbon. A normal sized discoidal vesicle
lying flat against a ribbon will overlap with at least 6 microtubules.
A strong association of a tubular vesicle with several microtubules
probably spreads the tubule into the very regular discoidal shape. The
arrow points to the sharp bend in the accessory microtubules
coming from the edge of the quadrulus where they contact the
filamentous reticulum (fr). cc, cytostomal cord. EM
taken on 4/18/79 by R. Allen with Hitachi HU11A TEM. Neg. 14,750X. Bar
= 0.25µm.
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