Laser interferometer measurement of changes in crayfish axon diameter concurrent with action potential.
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.
D000200:Action Potentials; D000818:Animals; D003400:Astacoidea; D001369:Axons / Q000502:physiology / Q000648:ultrastructure*; D007834:Lasers; D055095:Optics and Photonics / Q000295:instrumentation