Mechanisms for the excitation of "free nerve endings".
D000818:Animals; D004558:Electric Stimulation; D005071:Evoked Potentials; D008465:Mechanoreceptors / Q000502:physiology; D009411:Nerve Endings / Q000502:physiology* / Q000648:ultrastructure; D010812:Physical Stimulation; D012867:Skin / Q000166:cytology / Q000294:innervation*; D014981:Xenopus