[Changes in the extracellular potassium concentration and the slow negative potential in the cerebral cortex].
Changes of potassium concentration in the extracellular space ([K+]0) of the g. suprasylvius of cat cerebral cortex were recorded by means of K+ selective microelectrodes; the electrical field potential was recorded simultaneously. Under deep anesthesia a single electrical stimulus, applied to the cortical surface, at intensity enough to elicit the slow negativity, caused a local increase of [K+]0 reaching 0.1-1.5 mM. The time course of the K+ signal coincide with the course of the slow negativity. It is supposed that the slow negativity reflects glial depolarizaion arising under the action of K+ ions.
D000818:Animals; D002415:Cats; D002463:Cell Membrane Permeability; D002540:Cerebral Cortex / Q000032:analysis / Q000502:physiology*; D004558:Electric Stimulation; D004594:Electrophysiology; D005110:Extracellular Space / Q000032:analysis*; D008564:Membrane Potentials; D009457:Neuroglia / Q000502:physiology*; D011188:Potassium / Q000032:analysis* / Q000502:physiology
D011188:Potassium
Izmeneniia kontsentratsii vnekletochnogo kaliia i medlennyĭ otritsatel'nyĭ potentsial v kore mozga.