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Fig. 29: Oral region - undulating membrane and oral ribs

The undulating membrane is composed of two rows of basal bodies but only the outer row is ciliated. Both basal bodies are fully formed but only the ciliated member has an axosome (ax) and 9 + 2 axoneme. The oral ribs (or) each contain two microtubular ribbons of 4 and 2 microtubules (mt) respectively and alveoli (al) lie between. EM taken on 8/25/67 by R. Allen with Philips 200 TEM. Neg. 2,400X. Bar = 0.1µm.
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