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Vorticella convallaria has a contractile stalk that arises
from the aboral pole of the cell. The myonemes (my) from the
body converge at this pole and pass into the stalk to form a large
contractile bundle called the spasmoneme (spas). When
contracted the stalk coils into a helix. The spasmoneme is partially
encased in an extension of the pellicle (p) and a thin layer of
cytosol that is enclosed with plasma membrane (pm). An
additional secreted sheath surrounds the stalk. mac,
macronucleus; fv, food vacuole. EM taken on 4/6/72 by R. Allen
with Hitachi HU11A TEM. Neg. 7,500X. Bar = 1µm.
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