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Paramecium multimicronucleatum is covered with cilia
(c). These cilia arise from regular surface depressions roughly
rectangular in shape. A plasma membrane (pm) covers the
exterior of the cell and this is closely attached to a mosaic of
alveolar sacs (al) internally which in this micrograph are
expanded. Borders of adjacent alveolar sacs form septa (s)
along each row of cilia and sometimes laterally (ls) as well.
Septa do not follow the crests of the ridges. The ridges of the
rectangular depressions at their tips are filled internally with a
granulo-fibrillar (gf) material. Trichocyst tips (tt)
penetrate into the transverse margins along each row of cilia. In this
micrograph the trichocysts have been expelled and in a few cases only
their membranous casings remain. Collidine buffered fixative. EM taken
on 12/20/68 by R. Allen with Philips 300 TEM. Neg. 16,000X. Bar =
0.5µm. Published in J. Cell Biol. 49:1-20, 1971.
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