The external action potential of a nerve or muscle fibre in an extended medium.
D000200:Action Potentials; D000513:Alpha Rhythm; D000818:Animals; D001001:Anura; D003201:Computers; D003714:Denervation; D004566:Electrodes; D004569:Electroencephalography; D004594:Electrophysiology; D008433:Mathematics; D008564:Membrane Potentials; D008839:Microelectrodes; D008954:Models, Biological; D009046:Motor Neurons / Q000502:physiology; D009132:Muscles / Q000502:physiology*; D009210:Myofibrils / Q000502:physiology*; D009474:Neurons / Q000502:physiology*; D012879:Skin Physiological Phenomena