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Higher magnification of the three types of vesicles that are
transported along the cytopharyngeal microtubular ribbons. The ribbons
are seen here in cross section and show that the ribbons close to
their site of origin consist of 12-16 microtubules each. The discoidal
vesicles (disc) are flat, the larger acidosomes (ac) are
expanded and the small carrier vesicles (cav) are spherical.
Carrier vesicles tend to dock at acidosomes and small evaginations on
the acidosomes (arrows) suggest sites of fusion with the
acidosome. Behind the shorter rows of ribbons arising from the
quadrulus (top right of figure) are coated (cov) and uncoated
vesicles and early endosomes (ee) arising from the coated pits
of parasomal sacs and from coated pits arising from the early
endosomes. The smaller vesicles in this area are, in fact, carrier
vesicles (cav) that can be transported along the microtubular
ribbons. EM taken on 3/28/80 by R. Allen with Hitachi HU11A TEM. Neg.
18,000X. Bar = 0.2µm. Small part published in Eur. J. Cell Biol.
29:150-158, 1983.
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