Laser interferometer measurement of changes in crayfish axon diameter concurrent with action potential

Science  22 Apr 1977:
Vol. 196, Issue 4288, pp. 426-428
DOI: 10.1126/science.850785


Small rapid changes in the diameter of an axon takes place when an action potential progresses along the axon. In the giant axon of the crayfish these occur within a period of about 1 millisecond and are typically about 18 angstroms in total amplitude.