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The surface is sculpted into rows of depressions from which one or
two cilia (c) arise as extensions of basal bodies. The plasma
membrane (pm) is continuous over the cell’s somatic surface and
each cilium. It dips into the cytosol as an indentation at the base of
each depression. The plasma membrane covers an adhering mosaic of
alveolar sacs (al) that are continuous through a system of
pores (sp). Parasomal sacs (ps) and trichocysts reach
the plasma membrane through the septa (s) that separate
alveolar sacs. The proximal ends of basal bodies are linked to the
cell’s surface by kinetodesmal fibers (kd), postciliary
microtubules (po mt) and tranverse microtubules (tr mt).
A layer of striated bands links the sides of the ridges together and a
network of centrin-containing filaments called the infraciliary
lattice (il) lies at the level of the proximal ends of basal
bodies. Granulo-fibrillar material (gf) occupies the tips of
ridges. First published in J. Cell Biol. 49:1-20, 1971.
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