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Longitudinal section through the buccal cavity of the oral region
showing portions of 3 membranelles (1, 2 and 3): each membranelle
consists of 3 rows of cilia. The oral ribs (or) are seen on the
right side of the buccal cavity and are underlain by a filamentous
reticulum (fr) and by the endoplasmic reticulum (er). A
specialized cytoplasm (sc) covers the posterior left side of
the buccal cavity (bc) and a single layer of microtubules
(mt) covers the left side. EM taken on 2/9/71 by R. Allen with
Hitachi HU11A TEM. Neg. 6,000X. Bar = 1µm.
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