Abstract
A basic difference in locomotion between migratory cells and nerves correlates with a difference in distribution of certain microfilament systems. Lattice filaments are present where extension and movement of cell surface occur in both cell types. Bundles of sheath filaments which bind heavy meromyosin, are present in migratory cells, where displacement of the cell soma over the substratum occurs, but absent from nerves, where the cell body and axon remain fixed upon the substratum and “locomotion” is restricted to the axonal tip. It is proposed that the microfilament lattice is involved in the extension phase of locomotion, and the microfilament sheath in the contractile phase.
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